Please show us what $cpath actually contains, instead of describing it as "visually the same". See $Data::Dumper::Useqq for how to make Data::Dumper output invisible characters.

Also, consider trying to find out what triggers the "sometimes" situations. You might also want to record more information, like whether $file_system{ $cpath } exists instead of blindly grabbing its value.

In reply to Re: maybe, a corrupt selected entry in Tk::BrowseEntry by Corion
in thread maybe, a corrupt selected entry in Tk::BrowseEntry by igoryonya

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