I use flightgear 3.4.0, archlinux 64 bits, ati radeon HD 4650 PCie, with open source driver ( radeon ), intel CPU dual core 3.33 Ghz, 4 Gb ram,
kernel 3.19.2, mesa 10.5.2,
I notice that the first item in flightgear menus is missing if I use the property sim "--prop:/sim/rendering/multi-samples=3",
for example you can see thig bug here, the first item ( or label ) is missing on each menu :

this bug occurs only if I use the option "--prop:/sim/rendering/multi-samples=3", If I set to zero ( --prop:/sim/rendering/multi-samples=0 ) then I don't have the bug on the menus,
the command line who triggers the bug :
fgfs --enable-auto-coordination --disable-real-weather-fetch --enable-clouds --enable-clouds3d --bpp=32 --timeofday=noon --prop:/sim/rendering/multi-sample-buffers=true --prop:/sim/rendering/multi-samples=3
I tried to disable ALS, rembrandt but it doesn't solve the bug, the only way to avoid the bug is to use a "zero" value for the option "--prop:/sim/rendering/multi-samples" ( "--prop:/sim/rendering/multi-samples=0" )