Comment 5 for bug 1252050

Sorry for taking so much time to add details.

First I just want to mention that in the meantime Calibre 1.12 went out, but the issue is still there.

I have this problem on my two MacOSX 10.9 computers.
- The first was already running a working copy of the plugin on Calibre 10.9 and 10.10. The KEPub plugin disappeared from the installed list after restarting after upgrade to Calibre 1.11.
- On the second computer, I did a fresh install of Calibre 1.11

I have noticed two strange things:
- The first is that when installing, Calibre says the extension is correctly installed, and it even shows in the "Installed" section. Then when restarting, the extension disappears from the installed section and is again visible in the "not installed" section. In the directory ~/Library/Preferences/calibre, the extension zip file is there.
- I noticed the second on the freshly installed computer. My Mac is localized in French, and after installing the extension, the zip file was not "KePub Output.zip" as it used to be, but instead it was localized in French (Fichier de sortie KePub.zip). I tried to rename the file with the original name, but no success. Also note that on the upgraded version computer, I didn't try to re-install the extension so the extension file is still called "KePub Output.zip".

I've joined two logs I've done by restarting Calibre in debug mode:
- The first is the KEpub output extension install log
- The second is the log while restarting Calibre after installation of the KEPub output extension