Strange renderer warning

Hi
Here is what I've got in my logs:

Code:

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Warning: font renderer for ".pcf" already registered at priority 0
Warning: font renderer for ".pcf.Z" already registered at priority 0
Warning: font renderer for ".pcf.gz" already registered at priority 0
Warning: font renderer for ".snf" already registered at priority 0
Warning: font renderer for ".snf.Z" already registered at priority 0
Warning: font renderer for ".snf.gz" already registered at priority 0
Warning: font renderer for ".bdf" already registered at priority 0
Warning: font renderer for ".bdf.Z" already registered at priority 0
Warning: font renderer for ".bdf.gz" already registered at priority 0
Warning: font renderer for ".pmf" already registered at priority 0
Could not init font path element unix/:7100, removing from list!
(WW) Open APM failed (/dev/apm_bios) (No such file or directory)

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It doesn't prevent xfce to start but I'm just curious about those warnings I've always got does anyone could help me to understand them (I search on the web but I really found nothing about this warning and the reason why we could find it here)
Thx

Even though XFCE starts up, do all of your applications work? Are you experiencing any types of crashes? How do your fonts look?