I had an odd error with wigToBigWig that I tracked back to the *.len files generated by the updateucsc.sh script. With my last UCSC update, a majority of the assemblies have this as the single line: <META http-equiv="Content-Script-Type" content="text/javascript"> but others, like Zea_mays_B73_RefGen_v2, are fine. Rerunning this gives the same problem. Any clues? chris