Form edit not working

Hello,
I'm currently not able to do any kind of edits on forms backend, clicking on any field returns in no action at all, field's option panel is not expanding. I'm actually able to add new fields but not to edit.
I think this could be a javascript related issue, so I went with your theme troubleshooting and firstly disable absolutely ALL my plugins leaving gravity forms only and also switched to WP's default Twenty Twelve theme. The problem persists.

WP debug is not showing any errors related to the issue, but I managed to get some output from console, the errors are these:

Uncaught TypeError: Object [object Object] has no method 'qtip'
and
Uncaught Error: cannot call methods on tabs prior to initialization; attempted to call method 'option'
I think this latest one might be the guilty, the file outputting this is jquery.min.js on line 2

I have tried to gather all possible data to make your job easier, thanks in advance for any kind of help you can give me.

Hi David, thank you for such a quick answer, setting to non conflict mode solved the issue. My only question would be, what could be the conflict using wp default theme and having all plugins turned off? Thanks!

Thanks!