I ran into this problem with the Sonar X2a update...some previous files wouldn't open at all.  attempted to open them with the SHIFT key and loading no plugins at all...but still nothing.  I was hoping that this would be fixed with x3.
 
when I say doesn't open, what I mean is that sonar just "hangs" and does nothing.  I have to actually kill sonar via the task manager before I can do anything. 
 
strangely, I CAN open the exact file(s) in question with the STEAM version of Music Creator 6 Touch?!  something must have happened in the code during x2b that has persisted?
 
edited to state x2a, not b!

EDIT: oh, and I have tried to open the file in music creator 6, save it out, and then reopen in sonar...still doesn't work--same issue.  there's *something* in the file(s) that the new versions don't "like."  
 
may be it'd be nice to have an open feature that actually stripped out all "unloaded/ not found/ etc" plugins, so you could open with the SHIFT key and when it asks to load or not load plugins, you can actually strip it as well so it doesn't keep ANY information.  main thing is I just want the wav files/ track information, 'specially if there were lots of punches, etc.  trying to sort out all the little wav files in the audio directory won't work.

X2b?

I think he means X2a...there was no b - 2b is not to 2 b...

If you can share the project file or send it across we can take a look at it.

oops...sorry...yeah I meant x2a (sorry for the confusion)--not nearly enough coffee this morning ;)
 
anyway, noel, I pm'ed a dropbox file of one of the .cwps that I've had issues with.  i'm just going to assume it has something to do with some plugin or something it's trying to load?  (tho I think I still have all of them loaded on my machine when I look at the list of "can't load" plugins in mc6)
 
thank you
 
 

So far no problem opening files from previous versions.
I keep every Sonar version in which ive created projects installed.

I looked at your file. It loads fine for me but I have the following plugins missing when I load it.
Are any of these plugins bitbridged when you load it in X2? Try and isolate the issue by skipping those plugins. 
 
Superior Drummer (Synth Rack)
EZmix (Track: 'Superior Drummer 1 S1/2/S2/3: Stereo')
M30 Reverb (Track: '(Untitled)')
EZmix (Bus: 'Gtr Reamp Bus')
M30 Reverb (Clip: 'FX Chain')
 

Sent you a pm Noel,
 
but anyway, got back to this and still nothing works...I've now just installed sonar x1e and loaded up an old project--it loads!  I save out the file again as a "new" version.  attempt to load this new file in sonar x3b and still hangs!
 
I found another post somewhere mentioning an issue with loading lots of audiosnap transients, so I "made sure" that all the audioSnap options were turned off in this "new" file--just incase.
 
anyone else having this or a similar issue?  i'm running into the issue of not opening "old" files on various/ random old files on a random handful of files now.  I've upgraded the computer and interface since some of these original files were last "worked on", but that's not been a problem in the past. 
 
I've also never had any legacy file issues in any sonar version until x2a?!  when I first hit this issue someone else responded to a post stating a similar issue, but never heard any resolution(s).
 

• win 8 x64 i7
• RME UCX (some files had a Tascam 1884, some a roland quad capture, etc.)
• 24 gig ram.

Please send a link to one of the files that wont open (along with the audio) so we can investigate this.