(SOLVED) Help with audio dropouts, possibly caused by importing audio

Hello All,
 I have been having some issues with Sonar Platinum and huge audio dropouts. Basically I am half way through recording an album, all was absolutely fine until (this is the only thing that I can think of) I dragged in a vocal guide track from another version of the song on my hard drive through the Media Browser. As soon as I did this the project would then play for a few seconds, then stop, hang for a while and after say 20 seconds the audio dropout box would pop up. It would then take another 20 seconds before I could press play again. I tried shutting down the computer and it still did the same thing. I then tried opening a couple of other projects and the exact same thing happened, unable to play anything without dropouts.  I then tried un/reinstalling Sonar and this did not work, so then I tried creating new projects and copied all of the audio files in, then un/reinstalled Sonar and everything worked perfectly.Until yesterday......
 Yesterday, I again had to drag some audio from another project, this time I didn't use the Sonar browser, but Windows Explorer (I was dragging from a USB stick as the file was on my mixing studio computer) and blammo, exactly the same thing again. Now all my projects will not play and so it looks like I will have to create new project files again, copy in all the audio files (which is now even more as I have started recording all the guitar parts). 
 
Has anyone else experienced this or does anyone have any ideas on what I can do to fix this? I am running Sonar Platinum on an i7 machine with 16gb of RAM. I am using an Allen and Heath Zed R16 desk, all drivers are upto date and up until this problem I could easily run 50 or more tracks with effects, Pro Channel and everything else running and the CPU meters would only be hitting 40% or less. These songs I am working on now are only audio(a couple of the songs only have 12 tracks running, no effects, no Pro Channel and the CPU meter barely even registers.  
 
Any help or possible fixes would be greatly appreciated

I have to create new files as this is the only way that I can get any projects to play. What I think is happening is that for some reason whenever I drag in an older audio file it is bringing some corruption with it. So then any project that I open gets corrupted too. The only way I seem to be able to avoid this is, drag the audio in, save, close the project. Then open new project, drag in all the audio files. Save, close. Uninstall Sonar, I also uninstalled the Command Centre. Shutdown, restarted the PC reinstalled everything and all was ok. 
 Is there any data that can be carried across with an audio file recorded in Sonar that can cause this sort of corruption, I am thinking along the lines of time stamps etc that could be confusion? What I have also noticed is when this "corruption" does happen the time line seems to act strangely, the most noticeable thing is that it displays on top of the play/stop button at the top of the project view obscuring it.

Did your original guide tracks have any Melodyne or V-Vocal edits?
Did they contain any Audiosnap data?
Are they single, contiguous tracks or made up of shorter clips?

The word "Bundle" sticks out like a sore thumb.
 
What happens if you just copy the .cwp file (plus audio)?

The other point is I am not sure why this would then affect every project on my computer, dragging one file into one project shouldn't then affect every other project unless something is being changed in the global settings when this happens.
 
 
 

I don't believe this has anything to do with Manchester, as I have rolled back to previous versions and it still does the same. I am thinking that it must be a Windows problem, so I am going to try a few things tonight, including install Windows 10, give the computer a nice clean start and see if it is ok then.
One thing I can help with is rolling back, in the Command Centre I think you right click on where it says Sonar in the list of programmes, VST and available downloads then there are options to uninstall, roll back etc etc.
 
 

Thanks Dan, I will give this a try tonight as well, but I am not sure if it will make a difference as I have always dragged in files this way and it has never been a problem before. The bit that perplexes me the most still is why this affects every project once I have done this. I cannot think why importing one piece of audio into 1 project would then stop every single project playing. 
 I can confirm that it isn't a soundcard issue as I have tried both a Firewire card and a USB one and neither work.
 

I have solved the problem, it appears that there was no output for the midi, which for some reason seemed to have an effect on audio being dragged into the project. I reassigned the midi output to the onboard soundcard card and it started playing a lot better but I could still crash Sonar just by pressing play/stop repeatedly. I then swapped out the Firewire and hey presto everything works like a dream now. I can drag in audio files on the fly, set 16 tracks to comping mode and managed to record 250 plus tracks without a single click, dropout or any issue. I love Sonar again. 

Sorry I meant to write, swapped out the Firewire card in the PC. Looks like the one installed was not working correctly but all is well now.