@Dirk-71: OK, that's pretty conclusive that it isn't working.
Do you know if you are using temporary directory that is a symlink? Looking at the changes between 2.75.1 and 2.76.0, I found
this. It is to fix a problem with the viewer when running on Mac where the temp directory is a symlink. And the count pages plugin does use this. It is used to open the book to get the parts in it and then run the statistics over it. If this is broken for the plugin for you, I would think it would also break the viewer.
So:
- What do you have you the temporary directory set to? Is this the system temp dir or one for calibre?
- Does the viewer work with calibre 2.76.0? Did it work for 2.75.1?