brightness/contrast = 0

Hello,

my little daughter (< 2y) has played with the ATV remote control.
Now some of the local movies get played by xbmc with brightness/contrast = 0.
If I restore to 50/50 with (or without) forcing "set as default for all movies" the new setting don't get stored, so next time I play same movie I get black screen....

Any idea how I can fix that ?

xbmc: 9.11
skin: rapier
atv: 3.0.1

Thx!