I installed the Ajax Event Calendar (great plugin by the way) the other day. I just got around to starting to use it and I noticed that trying to rename existing categories or adding new ones leads me to a blank white screen when I try to submit. If I back out, nothing has changed - no new categories.
Also, I've seen in the instructions that it mentions being able to use a color picker to change the category color, but it doesn't show up.
I'm on the latest version of WordPress, I'm on the latest version of the Event Calendar plugin. I've uninstalled and reinstalled the plugin numerous times since I ran in to this issue.