[cybmole]

double click on any file in main window (used to open bbok in viewer) with latest version does this:
Traceback (most recent call last):
File "site-packages\calibre\gui2\actions\view.py", line 203, in view_triggered
File "site-packages\calibre\gui2\actions\view.py", line 270, in _view_books
File "site-packages\calibre\gui2\actions\view.py", line 238, in _view_calibre_books
File "site-packages\calibre\gui2\actions\view.py", line 104, in view_format_by_id
File "site-packages\calibre\gui2\actions\view.py", line 134, in _view_file
File "site-packages\calibre\gui2\actions\view.py", line 123, in _launch_viewer
File "site-packages\calibre\gui2\jobs.py", line 227, in launch_gui_app
File "site-packages\calibre\utils\ipc\server.py", line 166, in run_job
File "site-packages\calibre\utils\ipc\server.py", line 121, in launch_worker
File "tempfile.py", line 293, in mkstemp
File "tempfile.py", line 228, in _mkstemp_inner
OSError: [Errno 2] No such file or directory

NB open with... via the open with plug in still works. open by clicking on format name in book details pane fails as above. PC has gone thru sleep wake cycles with calibre in tray if that is relevant - running win 7 64 bit.

have not yet tried complete shut down / relaunch of calibre - cane straight here to see if it was a known bug already.
UPDATE: a shut
down / restart of calibre clears the bug - so cause may be to do with sleep / wake & changes to worker processes in latest version - just guesssing here?