If I write my preamble in my latexmain file everything works fine.
But if I include my preamble-file with:
file name: preamble.sty
Latex-Suite does not recognize the custom package, So EFI does not work the right way (\includegraphics instead of \psfig) because latex-suite does not recognize the in the preamble included package graphicx.
I tried to trace the issue and I think latex-suite just does not search through included files the right way.
The attached tiny patch solves the issue for me.