Nothing there Created 17 years ago2007-07-17 04:30:24 UTC by NineTnine

So i make a map with a couple of rooms, trigger etc, then i test it. Then i jump back into hammer and build onto it some more (brushes, triggers etc). i test it again and (sometimes) the new extentions i made are not there, only the stuff i had before.
I reckon it just a leak, but i want to make sure, incase its something else.

I had this problem when I first started mapping. I never knew what caused it then but now I reckon the bsp is going in the wrong place. Hunt down that rouge bsp file and delete any bsp files of that map, then try again.

There are roughly 53295728652.54 things that could cause this problem. I'm guessing you did a throrough scan through your compile log for errors.
Do you use a batch compiler or do you compile through Hammer?

hammer

If you use HL and Spirit, make sure you haven't selected to use the other compile options.

could you be a little spesific?

Did you export to map again?

no, but i will try tonight

Not sure if this will work but you could try copying the map into a new file and compiling that so it is fresh.