Realbot, after hours of headscratching I finally found a solution to my problem, which I recorded at The problem was utf-8 versus windows ansi.

Glad you found a solution. For those running into this kind of issue with automated crawling via LWP calls, it may be helpful to run CGI::ENURL::enurl on input data before getting/posting. And make sure that the script is saved in utf-8 format, or CGI::ENURL won't do its job right.

YMMV...