Using ActivePerl 5.10.0 under WinXP, running this: 
use OpenGL;
use threads;
my $thr = threads->create(\&update_memory_use);
sub update_memory_use {}

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I get this error: 
Can't locate package GLUquadricObjPtr for
@OpenGL::Quad::ISA at
D:\Web-Dev\dwarvis\trunk\lifevis\test.pl line 202.

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Huh? It doesn't happen when i leave out the thread creation.

In reply to Threads + OpenGL act weirdly? by Xenofur

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