Tag Archives: Red X

Dreaded "Red X" with OWA in Exchange 2010

It appears that after applying Hotfix Rollup 2 in Exchange 2010 Service Pack 1 (and I’d wager this may be an issue in the future), some users are getting the following error in Outlook Web App:

exchange 2010 owa “Couldn’t find a base theme (folder name=base)”

…along with a bunch of Red X’s where the images should be.

Turns out the issue is that, for a variety of reasons, Update Rollup 2 installed with insufficient permissions to apply some settings.

In order to fix this issue, you need to right-click on Exchange Management Shell, select Run As Administrator, and then run the following command:

C:\Program Files\Microsoft\Exchange Server\V14\Bin\UpdateCas.ps1

After running that command, restart your server and OWA should work properly again.