Using build 7.0.2762

I have created a Clarion DLL specified as Local that opens a window,
collects a string from a text control, analyzes it and used RETURN to send a
return value back to SetupBuilder.

I find that after the Clarion DLL is called if I task-switch to another
running program the running SetupBuilder created installation EXE displays a
"install.exe has encountered a problem and needs to close....." message. It
must then be closed/aboted.

If I do not task-switch to another running program the error does not occur.
I am using XP SP3.

Does anything come to mind when using a Clarion DLL with SetupBuilder that
might cause this task-switch triggered problem?

Thank you,

Mike