Thunderbird won't open because it's running but it isn't

when i try to open mozilla thunderbird it says that it's already running and i need to close the program first before it can start
i don't know if this is a common error or not
thanks

The parent.lock key should be auto removed each time you correctly exit Thunderbird.
For some reason, in your case, it was not removed.
But if you have another instance then this is the way to get TB up and running again.

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Thunderbird did it's part. it handed the URL to Firefox.
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I can no longer open .pdf files on my newer imac which is over 3 yrs. old, This issue seemed to have started sometime after updating to icloud & Lion?? on this imac but for some reason, I do not have the same problem on my other imac that is running the same Lion v. 10.7.2 which is over 4 yrs. old. I can see that the older imac is running Adobe Reader 9.4.6 and opens .pdf files.
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Message was edited by: keyag

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Go to Control Panel > Add or Remove Programs (Win XP) or Programs and Features (later)
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HT1925: Removing and Reinstalling iTunes for Windows XP
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Thunderbird won't open because it's running but it isn't

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