hello...I have use Bsp format and it works perfectly...but we have to be carefull and never scale any primitive...just selet them and with the tool of move vertex...we can move then and make differents objects...but remenber...never scale objects ...
Try to make the level by small sections and save every time you success
One of the best ways is extrude faces or to move vertex by select and move...it´s easy
the only reason to use the file bsp, is just to get fast and good collisions without getting crazy but there are many many ways...
I have several Bsp programs....but if it may help you...no one of them works with dark basic.... I prefer the x file converted to bsp with little program include in dark basic pro.
I can hep you with that: robertochafari@hotmail.com
oh my god