Profile manager - drag & drop + lightbox stopped working #clueless

I ran into two problems with the profile manager plugin, both in the admin section. 

  1. I can no longer drag and drop fields.
  2. When clicking on f.ex. settings the lightbox doesn't open anymore. Instead the window opens in _self.

Both problems are solved when I deactivate my theme, but I've no clue what I may have done that causes this. As far as I'm aware I didn't change anything there.

I noticed it after installing the event manager. There the location field was read-only. I could select it, but not add the cursor, or type anything in it. Maybe that's a clue too, but removing the plugin didn't help.

I looked in the source to see a difference between my theme and the original, but it looks pretty much the same. 

I've no idea where to look next, so any and all suggestions are very welcome. Tnx!

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