The worst condition for programmers is to be faced with solving a problem they cannot re-create to prove they "got it".
That's where we stand on the key change sounds; we can't re-create it at MTU, and none of our honored Beta Testers can either.
We went back to 4.06 code (which users told us does not exhibit the key change errors) and compared it to our 4.20 code. We did find some extra changes made by a consultant. We studied the changes and did not find they were needed or added new functions. So, we removed them.
Dspin, if you want to try our 4.20 Beta 9 version we are releasing for test tonight, I'll be glad to get the download link to you privately for you to see if we "got it" this time. If this doesn't fix it, then it is not our KEY CHANGE code... however as Ddouglass has been drilling into everyone in this thread, it is then either Hoster's combined set of new features, and/or your computer setup... which changes weekly (thank you Microsoft

).
If it is the combined Hoster feature set, return to using V4.06.
We expect to offer 4.21 (AFTER we upgrade Micro studio), that should allow disabling "memory hungry" individual features.
As Dale also pointed out, there are millions of WinTel computers and no program in our price range will run on all of them.