In answer to the question, I have more than one thread out here about EZ Drummer 2 issues. Sweetwater can replicate my problems easily by following the same scenarios. Toontrack and Cakewalk acknowledge the issue. Toontrack says it is waiting on Cakewalk to get back to them. I don't know Cakewalk's position on this.
Issues (and there may be others):
• In a project that had EZ Drummer 1, after the upgrade to EZ Drummer 2, opening the drum interface will break the soft synth routings. You can usually fix this by splitting instrument tracks and rerouting—but see the problems below.
• Many frozen synths cannot be unfrozen and therefore the routing can't be fixed.
• Synths do not freeze reliably.
• The project will lose either 1-audio from several of the soft synths or 2-all audio output (even though you see meters moving). Once the project is corrupted, I know of no way to fix it.