Occasionally, while using Internet Explorer, category and tab dropdowns are empty when creating or editing profile fields. This is caused by a bug in Mootools 1.2.x which reports DOM ready before theDOM is ready. This bug will be fixed in mootools v2.0.
In this article, I’ll go over how you can fix this issue before mootools v2 has been released.
To fix this problem, open the file./templates/admin_fields.tpl using a text editor. Around line 83, find the line of code that looks like this:
Change this line to:
This should now fix your problem.