IGB will load the Arabidopsis genome and scroll and zoom a location. Then, you can open the test BAM file. Reads should appear in a new track.
The plain text (SAM) version of the BAM file is here:
For your reference, here is a BAM file (with index and plain text SAM version) that does not give any error when opened in IGB. It contains 243 alignments on Chr1 in the region 12,746,479 to 12,748,601.
For more about using IGB links to move around in a genome, see this documentation from the IGB User's Guide.