After changing stream memory, r lod switch scale will reset

Hi guys,

after changing the stream memory in the videoconfig, the custom value for "r_lod_switch_scale" 0.3 will reset.

It doesn`t matter to which value I set the stream memory e.g. 200000 for 2-3GB or 500000 for 3GB. My graphic card has 4GB.

Custom "r_lod_switch_scale" value works only when I set stream memory to 0. 

Really don`t understand the relation of these.

Videoconfig is set to read-only and I don`t change any video settings in-game. These are the only reasons I know for resetting the config file.

This error appeared today at the first time, I never had problems to change the streaming memory and lod_switch_scale together.

Any ideas?