Um. I guess I'm not being clear enough. Thanks for the suggestions, but no joy here.

When I saw the problem the first thing I tried was to put in a "use IO::Select", then a "require IO::Select" to see if that made a difference. It didn't. Importantly in all cases PerlApp is still smart enough to find the dependent module and tell us:

Adding Module: e:/Perl/lib/IO/Socket.pm
Adding Module: e:/Perl/lib/IO/Select.pm
[download]

The problem isn't that the module isn't there, it's that for some reason the standalone exe is having trouble doing the "method call" to that module, but when using regular perl libraries, install environment, whatever it works fine.

So, any other ideas?