This may be something for RL to contact Avast (www.avast.com
As of today I have found my 32-bit iClone inoperable. Ofter some headaches (trying to reinstall, system restore, etc.) I found that the culprit was my Avast virus protection, which decided that ICTimelineU.dll is infected. I know it isn't, because even after a full reinstall I got the same issue. The 64-bit version is fine.
As if an animator's life isn't hard enough...
Anyway, I just wanted to report this in case somebody else encounters the same problem. I'll be on vacation (away from iClone), so I'm not immediately affected.
BTW, I think somebody at Avast hates 3D, because I had a similar problem with Mimic.dll (lipsynching in DAZ).