Error 2467 after installing SP2 for Office 2003

[Gulliwahn]

Hello

I've some access reports with several subreports on it.
In this subreport exists just one object called rtfMemo (it's an ActiveX
component).

Now in the masterreport I try to fill some text in the rtfMemo in the
subreport using this code:

Me.UbeRtfFusszeile.Form.rtfMemo = Me.rtfFusszeile

UbeRtfFusszeile is the name of the subreport-object.
I use this Code in the Detail1_Format event of the masterreport. The
subreport is also located in the Detail1 section.

This works fine since years and different Access versions.
But since I've installed the SP2 for Office 2003, I get the following error
(sorry, just the german version):

"Error 2467, In dem von Ihnen eingegebenen Ausdruck wird auf ein Objekt
verwiesen, das geschlossen ist oder nicht existiert."

Is this a new security functionality in the SP2 or just a bug?

Any ideas?

Best regards
Gulliwahn