The other day, I was reviewing a older report and most of the sections were collapsed. It stuck me as I, because I don't usually do that.
While working on a report just now, I suppressed a section (right click to the left of the report, and select suppress. The section collapsed.
I do this often while troubleshooting, to temporarily improve the readability of the section I'm working on. In the past, this action would just grey out the section, where I could still see the fields, even though they're suppressed.
Is this a setting that I might have touched? I've not done an patching, and I'm not aware that there's anything automatic going on...