Problem adding term to Multiterm TB from Studio 2014 SP2

From Studio 2014 SP2 desktop, I tried to add a new term to a Multiterm termbase which has a mandatory field. (I selected two strings in the source and the target and clicked on 'add new term' in the right-click menu.)

The add term routine opened a box warning that the mandatory field must be completed, but when I clicked OK, the Multiterm window closed, the box reappeared and Studio went into a perennial loop. Had to use Task Manager to shut Studio down.

I never had this problem up to Studio 2014 SP1, which still used Java. This appears to be a new bug.