Hi ! I got an "fatal error: GetMBlock:misaligned block returned" message wenn executing my program. Because I have no idea what that means,I decided to compile with profiling optin. (I youse a makefile as You describe it in the user - report.) So I changed the HC_OPTS (to: -O -prof -auto-all -odump error) and tried to compile. But the "Indexless linear algebra algorithms" library from Jan Skibinski,produced an error: "Orthogonals.hs:85: Could not find valid interface file `Prelude'" and "Orthogonals.hs:88: Could not find valid interface file `Complex'". (without profiling everything went smoth.) So what does this "GetMBlock"-error mean, and how can I compile with profiling ? Yours Andreas