Hangs on "Adding..." when inserting new field to form

Hangs on "Adding..." when inserting new field to form

My items were all working correctly yesterday until mid-day when suddenly adding any new fields to the form (Drop down, Single line, Check box, anything)  result in the page simply hanging with "Adding" for the field. If it is a lookup source, it does go through to steps to determine what the source will be and has the same result of the addition simply hanging there...


Any suggestions?