[pthwaite]

I cannot get the new version to run.
tried downloading several times from both sites and always get this error:

...calibre, version 2.0.0
ERROR: Startup error: There was an error during calibre startup. Parts of calibre may not function. Click Show details to learn more.

Traceback (most recent call last):
File "site-packages/calibre/gui2/main.py", line 238, in initialize_db_stage2
File "site-packages/calibre/gui2/main.py", line 188, in start_gui
File "site-packages/calibre/gui2/ui.py", line 249, in initialize
File "site-packages/calibre/gui2/layout.py", line 300, in init_main_window_mixin
AttributeError: 'Main' object has no attribute 'setUnifiedTitleAndToolBarOnMac'
...
Any ideas?
Howard