Time machine backups not visible-changed computer name

I found that I could not access any of the Time Machine back ups. I checked and the computer name had an apostrophe in it, also spaces. I changed the computer name to remove those and used ASCII characters only. The was yesterday evening. I still can't see any of the backups, although I've heard the hard drive I use for TM running a couple of times since then.
Does anyone have any thoughts on what the problem might be?

I do not see the backups thru Finder or thru the TM browser. I can get into the Time Machine browser, but the only time period displayed is today. The arrows to move backward and forward don't do anything and the bars along the right side are not labeled with dates or time as they should be. Thanks for any help you can offer.

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