December 2012 - same problem.
We got the same again. Version 6.1.98.34 dated (2-May-2012) was re-introduced a few days ago with critical update KB2726929. We use up-to-date XP SP3.
The same thing happened this year in August.
On two of our PC's business critical applications stopped working with strange error messages about "unavailable objects on this machine". I lost 3 days over this problem back then, and an hour today.
Note that I have found this chat after I solved the problem myself, by system restore and selective Microsoft update, excluding --for once and for all-- the recent KB2726929 (and the KB2687323
backthen in August). In August I had to do this 8 times before I had found mscomctl as the culprit. This time in December there had been 11 critical updates, but the mscomctl immediately caught my eye, so I needed only one go.
Perhaps the simple here above described solution with unregister/logoff/logon/re-register would have worked, but I'm not going to try it out on these PC's. They will stay as-is.
My question is: what do I do with the other 60 PC's here that do not run this third party software? Shall I wait for them to face some other strange problem in some application? Or do I just execute a preventive unregister/register on all of them?