What version of Live are you running ? I'm on 7.0.2 and so far it's running ok
I did have a problem with another vsti that did what you describe and what I did to fix it was to remove the .dll file from lives vst folder open live without that .dll then copy it back into the vst folder and let live re-scan it.
then it worked ok from that point not sure this will work for you but it's worth a try.
you might also try to post over at the Ableton forums and see if anyone there has any ideas and also to the abes tech dept. hope you get it sorted out mate.
V-Tek