It will happen randomly, even when im not using spb. It happens after a reboot. And im forced to reflash.
Is your issue that after a reboot that all your apps start spewing force close messages and you can't do anything with the phone?
If so I had that problem as well after my first flash. I posted it a bit earlier in the thread but after flashing and spending a couple of hours getting all my accounts set back up and all my apps restored I rebooted. The reboot took a while and when it came up I got the welcome screen as though it was a fresh flash. I tried to skip past it to see what we going on but then the force closes started and wouldn't stop.
I finally wiped the phone and re-flashed. After that I added all my accounts back in and rebooted to make sure everything was fine, and it was. I then tried to just restore my data partition (backed up after the problems started happening but before I wiped) and that didn't help. The force closes came right back, so it looks like the issue was something corrupted in the data partition.
I then restored back to another backup made after my 2nd flash but before the /data restore, and then restored all my apps with titanium and got everything back to the way I wanted. After that I've rebooted a few times now and so far so good.
It seems that something in the reboot process must have corrupted part of the /data partition, but I'm not a dev so I couldn't even begin to guess what it was.
I have had similar problems with most ROMs I've tried on here. I've had the stock ROM randomly nuke my Bluetooth pairing after a reboot, as well as disable some of the touch buttons (the only way to fix was to do a factory reset). I've also had certain apps force close all the time until I uninstall and re-install.
Back on Eaglesblood I had 3 different apps that I could restore and use but after a reboot they'd disappear. The only way I could get them to work after a reboot was to uninstall from Manage Application, then install from the Market and not restore the data from Titanium. However the same Titanium restore of the same apps did not case a problem with the Sinister ROMs or this one. Lots of really strange things going on with this phone, I can't wait for an official 2.3 update and hopefully an end to a lot of these bugs (wishful thinking I know).
I love this phone and I love the ROM work going on but man my Vibrant was much more stable with the Bionix series of ROMs. I just keep telling myself to give it time.
