After Mountain Lion install Time Machine states no existing backup

I upgraded to Mountain Lion and can use "Enter Time Machine" to see previous back ups.  However, the other time machine related windows (e.g. the control panel) state there is no existing back up and, accordingly, no last back up time.  I am concerned that if I perform a back up it will wipe the existing record as it does not seem to recognise the existing back up even though it will eventually enter it when I click "Enter time machine".  I would appreciate any advice from those who understand time machine better than I do.  Thank you!

No, not a problem. 
Is the disk shown as the destination for your backups?   Have you disconnected it since the last backup? If so, the info on the TM window just hasn't been updated.  See #B3 in Time Machine - Troubleshooting.

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