general cfg question

ok, i was messing around with my cfg, trying out better quality settings. after realising my pc really is too shit to keep frames stable with higher quality settings, I tried to revert back to some of the values i was using before.

before i re-install has anyone got any idea why ET won't accept the changes i am making? this is an example of what happens:

i do /r_subdivisions to see what value is currently set, result "20". however it is set to "90" in my cfg.

i do /r_subdivisions 90 and then repeat the step above. result is still "20" BUT i get another msg underneath saying Latched "90".

when i vid_restart the values haven't changed. same happens for r_picmip. i check that it is at "2" in my cfg. it is. why then in-game is it still @ "1"?

i've checked there are no repeat instances of these in my cfg so any help would be great - i'm stumped!

would it be anything to do with the etconfig file, maybe?

thx in advance