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Hi Anthony,
We currently have two separate reference sequence tracks that correspond to the hg19 human build. It is recommended that you download both of them to avoid the reference sequence error (code 18) that you received when loading your BAM file.
The first build is the GRCh_37 build that was curated from data obtained from UCSC and the second is the GRCh_37_g1k build that was curated from 1000Genomes data. These builds differ slightly most prominently in the mitochondrial region so GenomeBrowse considers them separate human builds that correspond to hg19.
The GRCh_37_g1k build was just made available yesterday when version 1.0.7 of GenomeBrowse was released for download. If you update to this build GenomeBrowse should automatically prompt you to download the corresponding reference sequence when you load your BAM file.
You can update GenomeBrowse by downloading the current version from our website.
You can also download the track from the Add dialog under the Annotations tab. To make this build visible you will need to uncheck the option at the bottom of the dialog to "Hide sources for genomes other than...". The track is called Reference Sequence, 1000Genomes and the build is GRCh_37_g1k.
Please let us know if you have any further questions.
Thanks, Jami...
