Sorry I can't help with the specifics of your problem, but you should upgrade to the current 3.0 release and see if it still happens. There were a couple of changes after RC1. In Tiny Core the RC's (Release Candidates) at a particular level are test versions of the eventual release at that level, e.g. 3.0 RC1 is an earlier test version of 3.0.
If the problem still occurs you'll be able to get some help.