I can create a door that opens, letting me into a room. Once I am inside and the door closes I have to walk up to the door and turn a way and then use the ""use button to open the door. If I just try to open the door normally it won't open. I am sure that I have done something stupid.
is it a use only door? If so You can make it so that you dont need to press a button to open it. It sounds like a glitch to me I have had entities such as func_train do weird stuff along those lines for no apparent reason but i have never heard of that unless there was a button to open the door and there is a delay before re-use and it just so happened you just tried to open it within the delayed time period and then when you turned around and you pressed your use button it worked because the delay before re-use was over. Idn it sounds weird to me.
I have made a new board. I put only a door in it and a ct entity. I am using counter strike fgd provided with hammer, and the halflife.wad. When I build the door and run the map I cannot open the door with out specifying use only. I have also turned on the one way flag and turned it back off just in case it was stuck.