Hi there,
today i was playing BMS @ chapter 11 and when you go into the room where the three academic keep out because they are scared than the door closes and you get shot by a lot of opponents the games laggs extremely at me.
at the first time i died because of the lag and than i get a source engine error:
https://imageshack.us/a/img507/7660/errorchaptereleven.jpg
and short after this when you swim through the dam my hl2.exe crashed when i came up the water. the second time i slowed down and it worked but when you use the speed from the dam the game always crashes
best regards and nice game