Errors with using -developerkeys

Whenever I try using -developer and -developerkeys, the bullet time always screws up. Like, Max won't run properly and in fact normal speed occurs during bullet time, as well as a shimmer effect not normal in the game. I don't have any mods installed. I don't know whether this happens with both lines used at the same time or not (its what I had), but after using bullet time max's normal speed starts becoming really slow when running. Anyone else have this problem?

[MarkusRMD]

with -developerkeys you can change time with home/end, perhaps you have game controls configured to those keys and they overlap? Also ins/del, pgup/pgdown are reserved by developerkeys as well as many other keys.