Hello, I am not the original poster but we are having a similar/same issue
We are currently using IGV 2.12.3. When opening the Desktop app, we receive "Error loading genome: hg19". Pressing OK gives us " Unexpected error:null. See igv.log for more details". I do not know where to find igv.log
Clicking on Hg19 from the top left gives "The genome [Hg19] could not be read. Would you like to remove the selected entry?".
I have also tried Going to Genomes>Select Hosted Genomes and receive the error " Warning: could not connect to the genome server (https:\\
s3.amazonaws.com/igv.org.genomes/genomes.tsv) Or locally defined genomes will be available." This opens to a "Hosted Genomes" window that is blank with nothing to select. I'm not sure if this is related.
Thank you,
Paul