Haven't had probs with it, but i'm not using the latest version of backglassserver yet.
Here are some usable details when using the latest version :
set some 'Visibility' options for the grill, VPinMAME DMD and/or the B2S DMD
- 'Grill' can be set to 'Hidden' or 'Visible' or can be set to 'Standard'. The first two options are pretty clear, the third option 'Standard' uses the standard setting of the 'screenres.txt' (set 'LED Display X Offset' and 'LED Display Y Offset' both to '0' show the grill, other values than '0' hide the grill).