FamiTracker 0.4.6 from rapps does not redraw all GUI elements when maximizing

VBox 4.3.40 with VBEMP
ros 0.4.7RC1
FamiTracker 0.4.6 from rapps

Observed result
When I maximize the GUI window of Fami-Tracker 0.4.6 from rapps it will not redraw all GUI elements properly.

When I restore to windowed mode - they are still not drawn.
But moving the window afterwards will redraw almost all elements properly.
FamiTrackerMaximizing.webm
047RC1-FamiTracker.log

Expected result
2k3sp2_ok.webm always draws all elements upon maximizing (and also upon restoring the window)