The current object has been released.

I'm getting this error each time I run the app after running it initially and accessing a specific form. The error happens during the logon process and appears to occur on an "EndIf" line, but "ThisForm.Release" is the previous line run. This logon form is not the form that must be accessed to cause the error on the next run. FYI, the only thing changed recently since this error started happening was tearing apart a combobox class to try and locate some aberrant behaviour. The help on the error was, IMO, unhelpful stating simply:

The current object has been released (Error 1945)
You have issued RELEASE THIS in the destroy event of the current object.

Any ideas? Thanks!

Regards, Renoir