Can't edit Thank You page

Today I cannot edit the Thank You page on any of our forms.  The lightbox window opens on the right with what appears to be a small drag-able window containing text (except it isn't drag-able), and two buttons 'Redirect to page' and 'Edit text' however nothing is responsive.  Frustratingly you can't even close this lightbox window and return to editing. The result: lost editing.  Tried in Chrome and IE11.  Jotform these are issues that simply should not occur, if you are updating the back end then try it in a sandbox or something.  Haven't you heard of the saying 'if it ain't broke, don't fix it'?  Well now it IS broke so please fix it, cos we can't be the only ones unable to edit this.  We have a different thank you page for each form so we're stuck until this is resolved!

Please accept our apologies for this situation. We are making some updates and this can result in temporary difficulties in using some of the features.

I tested and could edit the Thank you pages, so I believe this situation is now solved. Please try adding &old to the form editor url and try to make the changes you need:

http://www.jotform.com/?formID=52914530010946&old 

Let us know if the problem persists.