SAP Netweaver Portal 7.53 Blank Logoutpage after Logon-Ear Update

Hello,
we just updated the logon EAR File of our Portal. Nearly everything is working out so far. The only thing is, that the logoutpage is suddenly completely blank. I cant see suspicious things in the NWA logs. Maybe it has anything to di with the IdP Configs?
After the IdP-Redirect it should route me right to the logoutpage. HTTP-Request displays a 200, while giving me a blank page.

Has anyone experienced a similiar problem yet?

Thank you!

Daniel