a lot of tracks are blank at first and only appear when you change the locus.

[eternal-flame-AD]

Moved from #1847

At this commit: b59d29d

You may see a lot of tracks are blank at first and only appear when you change the locus.

Very simple POC, its just your https://github.com/igvteam/igv.js/blob/master/embed.html with the following change:

  var config = {
      genome: "hg19",
  };

POC with full source tree checked out (no test):
poc-b59d29d4.tar.gz

Only poc.html and dist/igv.min.js:
poc-b59d29d4.min.tar.gz

Firefox 128.0, linux x64.

I do not have access to a different browser so did not test on Chrome, etc.

[jrobinso]

What is "POC"?

[eternal-flame-AD]

Proof of concept

[jrobinso]

The issue is with the whole genome view, looking into it.