Sorry.
How did you do that?

EDIT: I think I've just found it, but it was really hard to do.

It wasnt hard to do, just had to crouch jump And it works on all windows

The windows were a prefab, so if the prefab has any problem, all the windows will have it.
But I'm just uploading the map fixed.
I'm really sorry for the bugs.

The windows were a prefab, so if the prefab has any problem, all the windows will have it.
But I'm just uploading the map fixed.
I'm really sorry for the bugs.

There were few other issues as well, so dont upload just yet new version, if it only fixes windows. Send me PM and I will help with some

Soy-oy I had this problem too. 

To fix people jumping out of windows you go to textures>usage>tools Then select clip

Now move every window back a little bit to create a space like this

                                  I  <---- Wall
              Space ---->    I  <------- Window
                                  I <---- Wall

Now fill that space with "clip"

Basically, if you put clip in front of a window, players will NOT be able to go through it, but zombies will. (Ignore "clip_player" It didn't work for me  ) So what I'm telling you is just back the window up a bit to create a space, and fill that space with clip. (By the way, the space should be rather small, as even a tiny brush of clip stops players)

Hope this helps! 

I wanted to try this out, but it crashed upon loading. Anyone else experience this?

This also happened to me. How do we fix this? What is needed in order to play it?

Awesome downloading it now

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Double Post Merge

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loading it now

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Double Post Merge

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testing map

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Double Post Merge

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made it to round 19 first try

downloading thanks for mega link