Recently I met problems like these (shown  here in  minimal, stripped down examples no longer doing

anything useful except illustrating the problem). Any suggestions about what is going on here would be appreciated. Thanks.

> interface(version);restart;

Maple 10.03 gets stuck on my machine (Mac OS X, version 10.6.4) evaluating  the  first execution group below,t hough in Maple 6 on Mac OS 9.1 one gets only some strange output  (?s, similar to those in output below). In the procedure f, the parameter W is intended to be a module exporting  a procedure  W:-m; the behaviour is not improved  by careful type declarations, so for simplicity I've left them out.