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.
Solution
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:
1 window.addEvent('domready', function(){
Change this line to:
window.addEvent('load', function(){
This should now fix your problem
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Very good help for my SE. Thanks