Adding time signature to master palette obscures other time signatures in palette

Ubuntu Studio 14.04, GIT commit: e87ef84

1) Master Palette
2) Time Signatures
3) Create Time Signature: 5/8
4) Add

Result: display of the available time signatures changes from a grid to a single row, which doesn't fit on the screen so the newly added time signature and others after the first few are obscured.

The palette redraws itself if you resize the dialog.