Ok. The craziness continues - after one play in X1 (which was successful, remember), I opened it back up in X2 (no file save in X1 so it should be the same exact file) and it played back successfully again. This is what makes you nuts.
Bob:
Thanks for your offer to help. I was going to ignore you because I've been doing this stuff since we were overclocking Celerons way back in the day. But I reminded myself of one of my favorite sayings, "Do you want to feel like you are right or do you want to fix the problem?"
So in that spirit:
1. OS version and maintenance level - Win 7 x64 Home Premium Service Pack 1 - latest update a few days ago, IIRC
2. Audio Interface model and exact driver version - Frontier Dakota Driver version 5.12.1.0
3. Audio Interface settings for Sample Rate and ASIO Buffer Size - Buffer size 128 Samples 24 Bit, 44.1
4. Sonar version (X2, X2 with quick fix, or X2a) - X2a x64
5. Sonar setting for Sample Rate and for Record Bit Depth - 24 Bit,. 44.1
6. If a USB connection for audio interface, please tell me if it is plugged into USB 2 or USB 3 - No USB audio devices
7. Please detail the plugins loaded in the failing project, including all synths and effects - Pro Channel EQ, UAD Plugs, Wave Plugs, Eareckon
I'll post the list later because I'm loading the project and it looks like SONAR X2a is wanting to crash again. (not responding.)
EDIT: And we're back.
Waves CLA-76, Eareckon Analog PR-EQUA, Slate Virtual Tape Machine, Eareckon Eareverb, Slate Digital Virtual Channel, UAD LA3A, Toontrack EZmix, UAD Pultec Pro, Waves Maserati B72, UAD Cooper Time Cube, Waves L1 Ultimizer, UAD Fairchild Comp, Waves Q3, Superior Drummer, EZdrummer, EZkeys, EZplayer.