When I try to change volume, slider just drops to 0 and I can't get it back up. Had to create keyboard shortcut to increase volume.

At first I thought it was TeamViewer's problem, because it happened when I used it. Unfortunately...

From terminal:

Use of uninitialized value in multiplication (*) at /home/darkskyghost/gmusicbrowser/gmusicbrowser_layout.pm line 3181.

Apparently fixable by adding
$self->{max}= $max;
somewhere around line 3125 in gmusicbrowser_layout.pm. Probably not the most elegant solution, though.

it is the correct fix, fixed in git, thanks.