Black mesa problem with ".del" button

Black Mesa Archive In-game Issues
#1

every time i press .del button every npc or doors will dissapear and it start of game i fell off from cabin, how do i turn it off? i tried to change by binding but it does nothing, please help

#2

+1.
Stuck in Zoom mode, tried everything. Was surprised to see people disappear when I hit the NumPad period.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.