When I save my map im working on, it saves it bt when I compile it it compiles the map that wasnt saved before. For example, lets say make a map just a simple room with info_player_start in it and save it. Then lets say I added a barrel to it and save that, it still compiles the map that was made previously without the barrel. Any hints,clues,etc?

are you using .rmf format to save your maps in? the compile tools use the .map file to compile, one may not be created when you build a map in hammer, or if you use a batch script to compile you need to use .map format, or export your map to .map format before compiling.

cart source sdk hammer is different from hammer 3.5
its completly different.
like you actually import models into the hammer
but alien you need to make sure your using the most up-to-date version of the bsp
either that or something is completly wrong