I've had Lion installed for a few days now and am enjoying the changes to OSX.
Last night I wanted to delete a few redundant files out of my TimeMachine backup and found I could not open the application at all.
I can still backup to Time Machine successfully (so it indicates with preparing, backing up progress (xGB of yGB), finishing, etc). So for the last few days everything appeared to be functioning as expected until last night, when I tried to enter Time Machine.
iMac (Oct 2010), 4GB, 1TB, 3.6GHz, backing up to a WD My Passport Essential (1TB) via USB 2.0 (25% full)
I can see the destination drive (and its contents) on my desktop, via Finder and can select it via TimeMachine System Preferences (Select drive). There are no issues 'seeing' or accessing the drive in normal use.
Trying to open the Time Machine application, I have tried via the TimeMachine icon in the TitleBar (ie 'Enter Time Machine'), via Mission Control (double-clicking on Time Machine), typing 'Time Machine' into Spotlight and selecting it from the resulting list, but in all scenarios, nothing happens. Nothing at all. And yet I can backup to Time Machine without a hitch.
I have seen a number of online conversations about the AFP spec having been changed by Apple and third party periphial manufacturers being slow to comply, but using USB, I'm not sure this applies to my case? I have used Macs at home for 8 years and have never heard of AFP until now... So I don't really know if I am impacted by this or not (don't think so).
There have been some troubleshooting solutions involving identifying and deleting the com.apple.timemachine.plist from the Library/Preferences folder (going from memory here) which I did (had to use PathFinder to find the file).
Unfortunately that did not help and Time Machine still refuses to open. There are no errors appearing as a result of trying to open TimeMachine. I have checked the Console, but nothing obvious appears there. I have read others are prompted with an error about AFP, but I get no such error. I can copy files to the drive okay so I can't see how it is the drive. Just Time Machine not wanting to play...
Can anyone suggest anything?
I do have Snow Leopard SuperDupered to another 320GB WD drive if I need to go back, but I don't really want to if I can help it...