Somewhere around the upgrade from core 6.17, and possibly some other modules (maybe views), our My Issues page stopped working for non-administrator users.

Using the advanced search page and filtering on participant of a user name works fine, and returns results correctly, so it's something specific about the My Issues page, and not searching in general.

Requests with the user ID in the URL also results in an empty set for non-administrative users.

I have vague notions that it might be related to Views, but I'm really iffy on that. The drupal.org project_issue is obviously not exhibiting this problem, but I'm not at all confident we're running the same versions of stuff.

I also feel like it might be permission oriented, since My Issues works fine for administrators, but I can't find any permissions that seem like they would be related to this.

There are no errors in the logs, and no indication that anything is wrong in the result page. It's just empty of results, and no tweaks to the filters results in any results. I'm not sure what else to look at.