the audio stopped, and the message wouldnt go away after clicking 'OK' repeatedly.
did a force-quit, restarted Live. froze on startup.
noticed the undo.cfg file was 2.15gb so trashed it, tried a Live restart. froze again.
ended up having to trash the prefs.cfg, crashdetector.cfg and the undomarker.cfg to get it to startup.
ouch.
i was using 3 of pizmidi's audio2midicc vst, sending out 3 seperate CCs via IAC and routed back in again, mapped to various knobs in operator. it crapped out spectacularly.
i thought this issue had been fixed in Live 8 after all the M4L work done 'under the hood' to stop M4L LFOs etc from flooding the undo history, but maybe that only applies to M4L devices..?
[edit] after a rummage around the M4L forum, looks like you can tell an M4L modulator to be visible or not to the undo. handy! but i don't have M4L, and know F all about it. is there some options.txt entry that i can use to tell Live to ignore continuous modulators?
8.2.5 | OS X 10.6.8