Hi and thanks for caring,
I've activated and deactivated the plugin more times than I can count. How would I go in order to make a "clean" reinstall ?
Here is what I've done this morning :
I've uninstalled the plugin by clicking Events > Settings > Uninstall. At this moment, I still had the Event Manager related pages in Pages > All pages. So I went ahead and deleted the Event Manager related pages.
Then I reactivated the plugin and again, I have two "Categories" pages.
I've tried this on a brand new WP 3.5.2 install and there is no problem. So it's either a problem on my installation or some sort of edge case...
If nobody can reproduce, I'll mark the topic as resolved.
If that matters, I'm on WP 3.6.