First I must state that I am completely new to any kind of mapping, and Doom3/quake4 are my fav engines. I have spent the last 4 months learning from the awesome vid tutorials on this site.Im attempting to create some SP levels in Quake4, (just migrating from Doom3 mapping to Q4) and possible eventually a full blown SP mod as I do have a hobbyist background in 3d modelling. The issue is, I have 3 sections of a fairly detailed corridor with the last section branching off to a room, when playing the map, I can walk through all of the hallways and up to the door of the room, and the door opens, but there is an invisible wall in the way and I cant walk in.. there are no other entities or brushes there, and when I noclip into the room, I can see a warning that player clip model is out of world boundaries.. Whats up with that? All the textures used are of the same set that the other rooms are using with no issues, and there are no leaks at all as the map compiles with no errors. Any help would be appreciated cause if I am messing up something, it would be nice to know before I do it again.. Thanks for your time guys..

hmm.. interesting problem.
When you compile the map, read through the console output for any possible errors. that may shed some light on the problem.

Did you put any portals in the map that may be creating this invisible wall?
Do you have any scripts that may be placing the brush in this location?
Is the problem located in the middle of the map at the 0,0,0 axis point? This would indicate that something is being defaulted to the center location of the map for some reason.
Have you used the CSG subtraction tool? This tool can create some odd errors that go unnoticed until it's nearly impossible to fix. I am wondering if you used this tool and it has created a brush that you can't see and that extends through the map.

Some idea to try:
run some developer commands and look for the polygons that are being created for that invisible wall. Those commands are
r_showtris 2
r_usescissors 0
r_showprotals 1

try to selected the brushes in the call and connected room, copy and paste them into a test map. Compile the test map and play that. This may help you to narrow down the source of the problem. If you copy over the problem, then you have the source, otherwise you should look more closely to other areas of the map.

Hope this helps.

Man, major problems, I removed the room and extended the hallway to the room a bit, just to see if the invisible wall was still in the same place, and the map saves and compiles, and when I start it it crashes the game to desktop before it even loads., any change I make to the map and any name I give it or state i save it in crashes to the desktop as well.The editor shows no major warnings that I see in the console, and it compiles fine. The only script I am running is a script to spin an object on its axis, and I have never used csg subtract, the only such tool I have used is the hollow tool for creating rooms which I use all of the time, is the map just corrupt? oh yeah, and I have 1 visportal at the beginning of the map.