Weird TABCTL32 Error

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Windows

Win7

errors

TabControl

I am maintaining a VB6 legacy app for a client. There are thousands of copies successfully running all over the world with one exception. My client's customer is getting a RTE 339 error when accessing the TABCTL32.OCX on a WIN7 machine.

The thing that's weird is that if the customer boots in safe mode, it works fine. I have told my client to run regsrv32 as admin to un-register and re-register the ocx. Although regsrv32 reports no errors, it still 339s.

I have also had them run "handle.exe" to see if anything has a lock in the ocx but it comes up clean.

Any ideas why this would work in safe mode but not on a normal boot?