Product and version FMPA 16
OS and version Windows 8.1. FMS 126.96.36.1992 running on Windows Server 2012 R2
Went to Layout mode to set the tabbing order for fields. Although I could see the tab arrows with the numbers in, there was no sign at all of the tabbing control dialogue box. I searched right and below for it but it wasn't there.
I could select any of the tab arrows and change the tab order, I could move my cursor round the screen and also move the whole window round my desktop so nothing was frozen.
None of the menu items worked so I could not return to Browse. I could not close the Layout window either.
In the end I had to force quit. Luckily the database is hosted on the Server.
Reopened the database, went back to the same layout and tried again. The Tabbing dialogue box appeared fine and all was as expected.
No way to replicate it and no work around as far as I can see.