My category selection seems to work fine. Safari version: 7.0.5 (9537.77.4)
I have 2 categories, both showing up in Safari, so far so good
The length of the TAGS field is limited to 5 charakters. When typing more TAGS, the words moving to left. You always see 5 characters.
Then the plugin keeps showing the orange status bar in the right upper corner saying: Loading Suggestions
When trying to Submit the question, it keeps hanging (Showing orange status in upper right corner “Sending Your Answer.”)
In other words…this plugin doesn’t work in Safari ;-(