Act 6.0 Cannot Save Changes

[RonAnderson]

Was running ACT 6.0 on IMac using Parallels, suddenly when I try to update calender, message advises "Cannot Save Changes"

If I try to delete "Fatal Error Message" program shuts down.

Only change recently ( 3-4 weeks ago upgraded Parallels to Build 5.0.9344

Any help or assistance would be appreciated.