The solution is here:
http://rt.cpan.org/Public/Bug/Display.html?id=40261

Quote:
I think the module can be fixed very simply by commenting out two lines. 

# $protocol->parse_head($parse_head);
# $protocol->max_size($max_size);

[download]
These are lines 1496 and 1497 of LWP/Parallel/UserAgent.pm.

In reply to Re^3: Concurrent LWP usage (aka: LWP::PUA?) by Anonymous Monk
in thread Parallel LWP usage by metaperl

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