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I'm quite new to magic lantern so i hope that no one has filed this before - i did a quick search here for q scale problems but i didn't find this particular one so here it is:
I've been shooting a music video with the 10 feb build using q-scale at a setting of -12. since i got a buffer overflow shooting at a rather high iso i set it back to -10 (and saved config of course). after turning the camera off an on for changing the lens i got another buffer overflow and examined the reason: it was still set to -12! i tried to set it back to -10 again, but no luck after turning it off and on again: still back to -12. had to reset to the correct value manually for the rest of the shooting after every reboot.
i tried to reproduce the problem just now and it still was the same, tried to reset to several different values under -12, but still stayed at -12. then i tried to set it to -14, which worked, but i got stuck there. tried setting it back to -12, then it rebooted being set to -15!
btw, i've initially been using the feb 8 build, then updating the same sd card to the feb 10 build just before the mentioned shooting.