Something

[WAAAAAA]

Glbasic isnt cleaning the memory properly or something if i load 2 instances of glbasic and try to run some sample code it will have errors saying vars and functions from the other one arnt in the code and even cloding and loading another game i pressed spacebar and it loaded things from my other file wich wasnt loaded

[Synthetic]

Strange. I just ran multiple instances of GLBASIC ver 3.179 and had no problems at all. What version are you running?

[Kitty Hello]

Yes. That's incredibuild "feature". It creates compiled objectst that just will be linked if you don't change the code of any additional source file (.gbas).
If you want to have 2 projects open at a time (not recommended), you have to press the debug-button twice (that will clean the incredibuild information).
Compile times are a lot larger then.