I've seen this alot myself, but I thought it was because I'm using Ubuntu Karmic which is still in alpha. And I'm adding by drag-n-dropping from nautilus - not thru the add dialog.
I can never add more than a half-dozen or so books at a time before I get one of these hangs. Then I won't be able to add any books until I restart calibre.
When it does error out stating it can't open the tmp file, I've always found that the file does exist and the permissions/ownership is fine.
BTW, this error is by far the minority of the cases for me. Mainly the add dialog just hangs at 0% until I cancel it. I've left it hung overnight and it still has never returned.
troymc
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