Thanks for this answer JeanPaul.
Actually i don't have any problem with the vertex tool, the issue i'm talking about comes with the clipping tool. I don't think it's due to invalid solids, i'm really careful about that.
I totally agree with the fact that it would be better that my floor is in brush (mainly because of the lighting as you said), and it was in brush before, the same way that you generously have done :
[Blocked Image: http://img98.xooimage.com/files/b/e/2/pente_deja_faite-4257d5a.png]
(it's the lower floor)
But i had the problem that i said to you, and i'm sorry but i have the same issue with your vmf, take a closer look :
[Blocked Image: http://img95.xooimage.com/files/e/b/6/grille_hammer_bug1-4257d5e.png]
[Blocked Image: http://img97.xooimage.com/files/3/e/1/grille_hammer_bug2-4257d66.png]
[Blocked Image: http://img99.xooimage.com/files/b/0/4/grille_hammer_bug3-4257d6a.png]
Maybe i just have this issue on my PC, i don't know (those screenshots were taken in a grid scale of 1 and the biggest zoom possible), could you try to check yourself ?
So, this is the reason why i made it a model, because vertexes can't move once the model is compiled and the lighting isn't that bad with -staticproppolys and the other compile commands (i don't remember). And it seems that it doesn't bother the bots.
Still, thank you very much for this explanation, i didn't know about the texture thing.
Thanks puddy for coming yesterday, i'm not sure i will be able to make the paths less "twisty and turny" but i'll try and yes, i also think there is a balance problem, especialy in the main entrance. I'll try to do something helpful for the CT. Thank you