User agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0
The category autocomplete doesn't work properly for categories with colons in them. The part of the category name after the colon doesn't show up in the list of options.
For example, I found this problem when trying to add the category: "Photographs by User:99of9"
Version: unspecified
Severity: normal