[madmads]

hi
i have been using calibre for some years now. after i updated to version 2.75.1 yesterday something went wrong when i restarted. my icons reverted back to the default set. i tried to change the theme to monstre - as my chosen one. but when i apply the change i get this error message:

calibre, version 2.76.0
ERROR: Unhandled exception: <b>error</b>:(5, 'MoveFileEx', 'Access is denied.')

calibre 2.76 [64bit] embedded-python: True is64bit: True
Windows-8-6.2.9200 Windows ('64bit', 'WindowsPE')
('Windows', '8', '6.2.9200')
Python 2.7.9
Windows: ('8', '6.2.9200', '', 'Multiprocessor Free')
Successfully initialized third party plugins: Find Duplicates (1, 6, 2)
Traceback (most recent call last):
File "site-packages\calibre\gui2\preferences\main.py", line 398, in accept
File "site-packages\calibre\gui2\preferences\main.py", line 359, in commit
File "site-packages\calibre\gui2\preferences\look_feel.py", line 638, in commit
File "site-packages\calibre\gui2\icon_theme.py", line 781, in commit_changes
File "site-packages\calibre\gui2\icon_theme.py", line 834, in install_icon_theme
File "site-packages\calibre\gui2\icon_theme.py", line 812, in safe_copy
File "site-packages\calibre\utils\filenames.py", line 487, in atomic_rename
error: (5, 'MoveFileEx', 'Access is denied.')

i tried to uninstall and reinstall, but nothing is working. i cannot change the icon theme to any other.

any advice on what to do?
thanks