Runtime Freezes after using Attachment Control

I have an ACCDB split database. I have a problem with Access
freezing/hanging when I am using runtime mode. Here are the particulars.
The form in question is a subform of a popup form (Modal "no"). The subform
has an attachment field. All works well when running in a normal Access
database window. However, if I run in runtime mode (using the /runtime
switch), after selecting the attachment field and then exiting (just cliking
"cancel" for example) the program hangs and I have to force shutdown using
the Task Manager (XP SP3). When I do, I get a popup that states "If you're
running a visual basic module that is using OLE or DDE, you may need to
interrupt the module.

Here is what I know so far...if I turn the master form popup property to "no"
I do not have the problem.
If I make the subform its own form (popup or not) I do not have the problem.
It seems to be a combination of it being both a subform and the master form
being a popup.
All compiles fine and the problem exists in both .accdb and .accde formats.

Any ideas or help would be greatly appreciated