[Genome] Browser gives strange error message

[Jeltje van Baren]

Hello Browser people!

I'm getting this message:
Error line 31133 of ../trash/ct/ct_genome_75a6_ca600.bed: chrUn_random 
not a chromosome

from the Browser (hg18), no matter what I do. I have reset my defaults, 
and I can go to the standard page (chrX:151,073,054-151,383,976), but 
when I try to navigate away (by clicking on a zoom button or entering a 
gene id in the search box), I get this message.

-Jeltje