well, i am starting the guessing game now, but if i understand you right your root .exe is calling other (secondary) .exe's. if this is the case, i don't think that the secondary .exe knows what the root .exe did in matters of 'set classlib...'. therefor the seconday .exe has to search for the .vcx in all the different path's.

>SET CLASSLIB TO FournierTransformationListe ADDITIVE

>
>at the top of the program. So, this is executed and put in memory. It's still a mystery why the other EXE can't see it on one specific server. That object is part of the included files of the root EXE.