JIRA problem with Portable FF that does not occur in non-Portable FF

I have both a non-portable and a portable version of the latest FF on my work system. Both of them have no extensions.

In the non-portable system, all the sections of my JIRA dashboard display correctly. If you're familiar with JIRA, each of my 'filters' displays all the results.

The portable system, on the other hand, displays only ONE of my filters and the others are empty of results. I can get them to display by maximizing them (which then displays everything) and clicking "restore" to put them back where they belong.

Any suggestions for diagnosis? Setting changes? This started a few weeks ago and, IIRC, version 31.