• Did you check if CGI::Fast returns text strings (i.e. with UTF-8 flag set)?
• use open ':utf8' only affects open (iirc), so it's useless you unless open files.
• Do you use binmode STDOUT, ':utf8';?
• Don't use Encode::_utf8_on($flagOn);</li> - it's an internal method of the [mod://Encode] module, and shouldn't be called from the outside. Use <c>$string = decode_utf8 $string; instead.

Now - occasionally! (which it also does under simple cgi not fast cgi operation and seems to be connected to overall load) - my upload crashes with CGI.pm (version 3.33) throwing "Malformed utf8" in apache's error.log

What does "occasionally" mean? Does it alwyays die for the same set of data?

And finally: does the data contain malfromed UTF8?

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