@Kovid - aah, thanks for the steer. Though it seems there is a bug in the calibre FontFamilyModel class (which my plugin uses but it seems no calibre code does any more) as there is an error:
Code:
calibre, version 0.9.5
ERROR: Unhandled exception: <b>TypeError</b>:'tuple' object does not support item assignment
Traceback (most recent call last):
File "calibre_plugins.generate_cover.action", line 50, in _generate_cover
File "calibre_plugins.generate_cover.dialogs", line 1211, in __init__
File "calibre_plugins.generate_cover.dialogs", line 854, in __init__
File "calibre_plugins.generate_cover.dialogs", line 309, in __init__
File "C:\Dev\Tools\eclipse\workspace\_Misc\trunk\src\calibre\gui2\widgets.py", line 363, in __init__
TypeError: 'tuple' object does not support item assignment