Are you sure the import file filters in the open file dialog are right?
Files of type.
 

I think I know what may have caused the problem. I've been rebuilding the project on my home machine and can see an issue with the wave files. There's 23 tracks with 1 wave file for each track. Track 16 is missing and two tracks are named Track 18. I'm thinking that Sonar got its data table mixed up. I've only lost 1 track, so at this point it's just annoying. My concern is more about why it happened and how to prevent it from happening again.

Before reinstalling, I'd try the renaming the file trick (quick and easy). Or better yet, open the file in a wav editing program, copy the audio, paste it to a new file, save under a new name. I bet the new file will import into the project without issue.

looks like take lane view ,. while in take lane view the clips wont appear under the track they appear under take lanes,.
i have had individual track actu p from time to time,. where there is nothing i can do for them move the daa to another track , rite clic,. insert new track then move the picture data to the new track,.
in your case it can be accessed from either your wave directory using windows or thru the browser view by hitting 'B'
thats the only thing i can think of rite now,
oh yes,
the file track maybe are showing way far off screen,.
relax,. would you,.
sonar is logical, it is allways something that is easy to fix,.
import at midi time or something could be something like that,. i dont recall now,.
1st
set the cursor on the left margin
and then drop the files into the track view from windows,
sonar will write the track name using the name from the wave file
when ever the files do not appear (usually)they are off screen,.
if your like me your gonna feel like a dummy when you see what it is,
thats the way i allwasy feel,.
theyre are only like about a million things that can go wrong
so take your time and dont get worried ,. sonar works good ,.
as i said, every now and then, a audio track stops working ,
hardly ever ,. if it does happen veryseldom,.
much easier and faster to insert a new track
(rather tnen try and figure out whats wrong and how to fix it,)
then move the data to the new track,.
delete the track thats not working, but i dont think thats your trouble rite now,
you may see it during the years ahead,.
i been using sonar for over 10 years now,.
every day,.
SONAR works good, when it doesnt, it is something i have set wrong or need to reboot or,
hardly ever, once or twice in the past 10 years, reinstall using the install file patch panic button fixes whats wrong, thats very rare,
i have had thousands of tracks in a project,.
never have seen them disappear.
have you tried looking under track manager?, hit 'H'

oh , yes the options for copy,. and drag copy
the new version uses something i did not expect that messed me up too,
rather then blend old with new,. it was saying move over to make room
there are 3 choices and once one of them is made , it stays there until you change it.
itll stay like that for months or years if you dont change it,.
but the new versions installer change it to slide over to make room' or
'align to measures' or something,.
really blew my mind when i saw it do that,.
i advise you not to cancel work ,
go check it out again and dont give up until you find it
your using the rite resource now, these forums are good and helpful,.
i recently added a new cellular phone,. i too have no internet connect to my machine,. normally,
however, new phone,. you can get them cheap nowadays on special deals,.
new phone has a usb cable port
(my old 5 dollar used phone had that port too,)
that i can plug into my machine and then i have internet,.
they call it 'usb tetheing"
have to pay for something else i dont use (mobille hotspot) to get the service but,.
it isnt unlimited , even tho i have an unlimited plan,
when im hooked up to the internet i have to watch it.,. microsoft' ll use up my whole allotment of bytes for the month doing updates
then the circuit slows WAY down 100 times slower to dial up speed,.
crawling,. 120kilo bits per second which was fast back when we used telex machines,.
and twx teletype machines,. 100 words per minute
that was early mid 1980's,. late70s, and 60's
telex was strong,. nowadays it takes several days 24 hours a day to update anything at that speed,. 300 years to send a full project
with all audio and all,.
workaround,. i can download sonar patchs direct to the phone then move them to the computer and that way i i dont use up any bytes of the phone to computer patch .,
it does work and is cheaper then having a phone and a computer hook up and i m on a low budget, but i am working every day on sonar,.
even tho im not receiving any kind of pay for doing so ,.i have product preped.
thats the main thing
im on fixed income so i have to watch my coins,.
i manage to buy needed upgrades or hardware too if i watch my coins,.
thats another story tho

maybe that'll help you hook up your machine if only temporary,.
your gonna find the trouble tomorrow when you look ,.
good luck,.
.for other help as musicians of all kinds and guitarists, there is afm.com

Could this have anything to do with a full picture cache?
 
Dan
 

I got nothing.

I have seen it where I recorded long w64 files with another app... DigiCheck... and the did not import properly.

It hasn't happened to me that I recorded with sonar and had any issue.

I would be sure to turn on project versioning so that I could get versions with the problem and without that I could provide to support.

I think you better bring it in so we can have a look at it.

I've recreated the project and only lost 1 30 second clip. The issue that caused all of my panic was that everything stopped. The client kind of lost it. I didn't know what was going on immediately but assured him that nothing was lost. I suggested that we carry on with a new project and finish the day's work. He didn't want to because he had lost confidence in me and Sonar. SO no work today. 
 
The customer doesn't like it when you make excuses. I knew we were good but he didn't want to continue until I found the problem, fixed it and could provide assurance that it wouldn't happen again. To make things more complicated, there's a documentary film being developed and the customer was going to have a film crew in to capture the creative process. That would include yours truly and Sonar. Let's just say it wasn't good PR for me or Sonar yesterday. One thing you can't say to the customer is "don't worry, these things happen all the time". 
 
It was a small thing that became a big thing, and the fact that I couldn't pick up the phone and call somebody became an issue. We have been working for months on this project with almost 50 hours of problem free recording. One little glitch and suddenly the sky is falling. But that's life. It's going to take about a year to finish this project so I'm pretty sure it will happen again. It's on me to deal with it while reducing any negative impact to the customer.

It's really unfortunate and you have my sympathies. I've never heard of something like this happening before...can anyone recall if anyone has experienced something similar? If so, it's important to get to the root cause and if not, that seems to imply "system-specific"...which means trying to find out what can cause something like this to happen so others can avoid it.
 
I've gotten use to the fact that computer-based recording is risky. I've had issues with classical music projects using Pro Tools, but because it's the "industry standard," people are more forgiving..."Well, you're using the industry standard software, so there's not much else you can do." Right.

Thanks Craig. Artists can be very emotional folks. If you kill the vibe, you kill the session.
 
While rebuilding the file I noticed that one clip was missing and two different clips had been given the same name. This has me thinking that the system for indexing the files got messed up and wouldn't allow Sonar to figure out what file went with what track. Tech support has offered no ideas other than reinstall and try again.
 
I think the customer was most annoyed when he asked me to get someone on the phone to sort it out. I told him that the company had no phone support. That got a real negative response and questions as to how"professional" the software was. I'm trying to forget the whole thing. Thankfully, good save and backup practices prevented any real loss of work, just 30 seconds of guitar. Ctrl-s is my best friend.