And I'm strict on use Strict.

Strictly speaking, it's use strict :) — module names are generally case-sensitive (even on Windows).

> perl -e "use strict; $foo=1"
Global symbol "$foo" requires explicit package name at -e line 1.
Execution of -e aborted due to compilation errors.
>
> perl -e "use Strict; $foo=1"
>
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Reason is that - if you use Strict - the use will implicitly attempt to call Strict->import, which isn't found, as the respective namespace is declared with package strict; in the module's source (this must 'fail' silently, as a module is not obliged to supply an import method).  Thus, any code in an existing import() isn't executed, which in turn renders some modules (and in particular pragmata) non-functional, or makes them behave differently...

Update: just in case...  for whoever downvoted without saying what's wrong (: this of course only applies to Windows, where the respective file is found at all, due to the filesystem being case-insensitive.  Geez...