Nice Feature.
Under VB 4.1.5PL1 the Warning PopUp dont show.

wow great thank you for the info so this was the problem :)

Do you have a solution?
I tested with IE, FF, Opera

Here is the German translation

Thank you very much for the german language :) I don't understand, you have vbulletin under 4.1.5 or not?

Yes I use a VB 4.1.5PL1
In the ACP all function there but the warning popup will not appear in the forum.
I have a test user account, where I have the profile fields blank

Are you sure that the id of the field is correct?

Yes, all Fields are blank in the account, no matter what ID i enter, the popup dont show.

Can you try please to put just one id and tell me if in that case works?

Sorry i test one ID, i test 1,2,3 or 5,6 and so on, i test original Style and my own Style.
Always the same result, the popup dont show

EDIT
Question: If it works correctly, the popup should be everywhere or?

Everywhere except the CMS