In addtion to what Yuri Rubinov already told you....
the .prg is probably newer than the compiled .fxp. Soemtimes if you compile the prg it wont create a new fxp if the fxp is newer than the prg. I've had this problem before when working with others in different time zone. An easy way to avoid this problem is just to delete the .fxp's and recompile...

>I am trying to debug some code, and set a break point in .SCX file. The function called is .PRG file. The message comes up in Debugger when call to .PRG is hit: Source is out of date.
>
>What does this mean, and how do I get rid of it?
>
>Fred Z