Ok, this is caused by an unresolved IE bug. I use a RepeaterControl that dynamically adds controls on PageInit in the IFRAMED page and ... well... you are not allowed to do this according to IE.
This is unbelievable
. I really don´t know how to get around this...
For the records:
I was using another script in the IFRAMed page that registered some
CSS styles for dynamically added controls. The script was
somehow scoping the parent page as well and this triggers an error in
IE.
It is still very annoying that IE actually fails to render the IFRAMed
page completly instead of throwing an javascript error. Anyhow, problem
is fixed now.
All the best,
Elmar