Time machine unable to back up after installing Mountain Lion

Just upgraded to Mountain Lion and Time Machine complains that the backup disk appears to be read only and cannot complete the backup.  Any ideas why?

I have exactly the same problem. Looking at other forums so do many others. Appears to be a bug in Mountain Lion.
The issue for me is that my iTunes and iPhoto libraries are also on the external disc which means I can't look at my pictures of play any music.
Apple, please fix!!!!

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