Look of all Creator apps changed ?

Today when I looked at my app, set up with tabbed layout, it was different looking - the tabs were not tab-shaped color images, instead they are just the text. When you select one of the tabs, the proper page appears but then the text for that tab disappears. I thought it was just my app, but all Zoho sample and shared apps that I tried also showed the same behavior. It's as if the master .css for the Zoho server got borked or something. Any news about this? Also, the small links in the upper right (Zoho Home, Blogs, etc.) disappear on mouse-over. Maybe it's just a matter of a background image that's missing?

I can attach a screencap if necessary.

Thanks,
Randy