Try using WinAPIOverride
to see if there's any difference in WinAPI calls between the old and the new Perl? If there isn't any, it must be somewhere else (flags in the EXE itself set by the linker? something fishy in the manifest?). If you do find something, it could be traced to the CRT and Perl's use of it.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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tags should generally be avoided. If they must
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taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.