Same deal for me, updated ZASS (use XP SP3 and IE8)
No change other than ZASS update now CPU hogged by vsmon.exe
ZASS tries to update when PC boots - takes about 4-5 minutes resting at 0% then proceeds, at end takes 4-5 minutes to end.
IE screens take 4-5 minutes to refresh
Close ZASS and PC runs as usual like a dream
Turn ZASS on - disaster again