Definitely a FM Go Bug. App developed in FM13v9 runs consistently on Win7 but under latest FM GO I get blank popovers at random intervals. The popover pops up but no fields or buttons on them. If one is blank, all of them on the same layout will popup blank. The buttons still work (since I know where they should be). Fix seems to be going to another layout and coming back and they will start working again... then some time later they start popping up blank again.