Ok so iv'e had this for a while now whenever I go to test my map I cant jump.. and if I crouch i can't stand back up also zombies can't kill me for some reason.. Help..? 

So I kinda messed up my zones and now when I try and play my map I cant go up my stairs, I cant jump and if I go prone I can't stand back up? Also I cant access end of the options in Radiant e.g Fx browser, Entity list etc. Anyone help me?

Is there a way to load back progress of a map because i'm doing a remake of Nacht and I have done so much detail and put so much time into it. I have messed up alot on zones like I can no longer jump and if I crouch I cant stand back up.. I really don't want to start again since I have done so much...

It was fine then all of a sudden I can no longer move ANYTHING around my map? Can anyone help me?