Rare, but it does happen on occasion. No pattern. Normal recording mode, not auto punch or looping takes.
Correct audio drivers installed ( the ones that work 99.9% of the time).
 
New install of both CWBL and SONAR last week. Happened on previous installs.
Happened on the newest install within days. Might go 3 months before it happens again.
 
It happens so rarely I wouldn't even know how to troubleshoot, but on the bright side...it happens so rarely ;)

dcmg
It happens so rarely I wouldn't even know how to troubleshoot

If searching the forum (with Google) does not turn up anything promising look at the Windows event log

I also suggest that if does happen to anyone again, before flying into a blind rage/panic, check to see if the audio file has indeed been created in your audio folder using Windows Explorer.
 
If it has and it's not exposed in Cakewalk by examining the take lanes, then you can simply import it

scook
a few things to mention for clarity -
Your .sig is correct
Do not start using Punch Recording if you do not already. It is just something to check because it often causes the problem. If you use loop recording and not punch recording it might be a good idea to hide the Punch Recording Module or at least move it away from the Loop Module. With unlimited tracks, I do not see a reason for punch recording. Recording on tape was different and punch was necessary.
 

 
I don't understand this.  Isn't this the FUNCTION of Auto Punch in/Out?  And what does unlimited tracks have to do with it?  If a function is supposed to work a certain way it should work that way and if there's a bug in the software it should be addressed by the software's creator(s).  If you're recording by yourself you don't have an engineer at the board to hit the record button for you and it's almost impossible to try to do it yourself in a tight space.
 
Sounds to me like there's an anomaly in the product that should be addressed.  What sense does it make to tell users not to use it if there's a problem with it.  Somebody in programming needs to fix the problem!
 
John B.

That the waveform disappears, does not necessarily mean the actual recording has disappeared. Did you audition the track after the take even though waveform was gone?
 
The waveform is an independent video presentation of the audio., it's not needed to hear the audio.
"Rebuild (or draw?) waveform" or emptying the Picture Cache file may help.

I just looked back on the link that Scook provided above and took notice that the solution they seemed to come up with was to go into the Preferences and uncheck "Allow Arm Changes During Playback/Record" and later, another poster suggested specifically to uncheck "Enable Synth Inputs" under the Allow Arm Changes option.  Over the past three years I've recorded 35 projects.  32 were in Sonar X3 and 3 were in Cakewalk by Bandlab.  I've never experienced this problem, and with the huge amount of Punch In/Punch Out takes I do I would've noticed it. It does concern me that so many of you are experiencing it though, because I worry that I too will someday find myself in the same quandary.  My "modus oparandi" might give a clue as to why I never had the problem.  I don't use Comping Mode.  I overwrite everything because the DAW is my "canvass" and I don't rehearse a song prior to recording it.  For me the DAW is a tool in creating the song as well as recording it.  I also don't use take lanes.  The only thing in Preferences I uncheck prior to working on a project is I go into the MIDI Record section and uncheck the "Zero Controllers" box because if I don't my MIDI recordings will disappear the same as what is described by the OP and others here.  I know we all have different workflows.  I'm hoping a description of mine will help to solve the mystery here, but mainly I'm hoping that this isn't just some kind of "new bug" that's been showing up on recent updates of CbB.
 
John B
 

I experienced this in Platinum a while ago but not recently. I never use punch in/out and rarely use take lanes though I do record in sound on sound mode.

The issue occurs when the vocal recording is perfect. As almost all performances contain flaws and errors, this is a rarely seen event, however when perfection is achieved the audio is immediately transferred to a higher plane in a process named by evangelicals as the rapture. Many believe that the audio engineer and his perfect recording will be reunited at the end of days, but others point out that the natural reaction of the engineer in this circumstance, including taking of the lord's name in vain will inevitably result in perpetual separation.

VariousArtist
Possible reason:

If you are recording to a track and this happens, check to see if that track has multiple take lanes. It’s quite possible that one of those has the recorded take and that take lane may be muted.

I had exactly the issue described a few times and each time determined the above to be the pattern. It started when I manually edited some take lanes and combined various clips by moving them across take lanes (not a standard user approach perhaps).

Later when I wanted a duplicate of that track I unchecked the clips copy and was surprised to watch my new recordings “disappear”. Upon inspecting the take lanes I saw my recordings there.

A fix for cakewalk could be to avoid copying empty take lanes when you duplicate the track. I’m not saying this is definitely the cause, but it only started happening when I followed the steps above, and stopped happening when I removed empty take lanes before doing a duplicate of the track.

HTH

I too have had the disappearing recording and I was frustrated at first but I was only testing all my mics and preamps on my voice so I got over it, then I found some just as described in this post, I was definitely using the nice duplicate button while getting the tracks organized, I think this is spot on, this has happened quite a while back as well and I didn't know to look in the lanes so it could have been the same problem..soo
 
If everybody wants to see this magic trick just follow these very simple steps.
1 Get a brand new track, set your input to your mic or whatever instrument you are recording
2 Open the take lanes and there should be only one available, mute that and close the take lane.
That's it, everything should look normal and all you have to do is record, you will hear your performance, you will see the waveform showing your performance all you got to do now is press stop, and smile while you recording disappears and hope this was your problem all along.

frankjcc
If everybody wants to see this magic trick just follow these very simple steps.
1 Get a brand new track, set your input to your mic or whatever instrument you are recording
2 Open the take lanes and there should be only one available, mute that and close the take lane.
That's it, everything should look normal and all you have to do is record, you will hear your performance, you will see the waveform showing your performance all you got to do now is press stop, and smile while you recording disappears and hope this was your problem all along.

 
ha..yes that process recreates the issue. Repeated this process several ways and it always seemed to be when track lane was muted. Otherwise, fine.
Hard to know if this was the circumstance every other time, but searching my memory banks I'm not sure it ever happened when I was in take-lane loop recording mode. Well done.
If it happens again, I'll open those lanes and check to see if it's still in tact.