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The current situation is not officially a Microsoft Confirmed Bug, but rather a community identified suspicious version regression. Similar scenarios have been shared across various forums and communities. However, because it is still very recent or hasn't gathered enough feedback yet, there is no specific information available in the Microsoft KB. Generally speaking, the fact that this issue is appearing on multiple computers and if no code or .accdb changes were made, serves as strong evidence of a probable rendering regression.
In this case, I believe the mmediate work around is to roll back the office build or roll back this update, keep an eye on Microsoft's updates, and re-apply the update once a fix is released.

I shared my feedback assuming you had already run the other checks, given your experience.
I didn't see the need to list out the usual troubleshooting steps for Access issues.

There is something funny with that build and the next one.  I posted a few day ago about lines showing up randomly on reports and box outlines off center.  I have been contacted by clients about this issue, which is pretty big as clients send invoice reports to customers.

After Adam emailed me yesterday about this, I looked into it a little further, and this issue has been reported by multiple Access users, and similar rendering problems are currently being discussed within the Microsoft Access MVP community as well.

There appear to be several recent reports involving display and rendering problems in Access, particularly with forms, reports, Print Preview, and PDF output. Some of the symptoms may be related, while others may be separate issues, so I don't want to speculate yet about exactly which builds are affected or whether they all have the same cause.

For now, if you're experiencing this, please post your exact Access version and build number along with a description of what you're seeing. You can find this under File > Account > About Access. That information will help determine whether everyone is experiencing the same problem.

So, yes, you're not imagining things. Something appears to be going on, and I'll post additional information here as it becomes publicly available.

I am personally very slow to upgrade Access, even on my training machine. I have a separate beta/test machine that I use to play with new features like form zooming, but I don't use that machine nearly as heavily as my everyday systems. My actual production machines, including the one that runs my business and the one I use for recording classes, generally stay a build or two behind specifically so I don't get bitten by bugs like this. That's also why I'm not always the first person to notice these problems. I have noticed a little wonkiness lately in one or two of my databases, particularly with continuous forms not refreshing or updating their display properly, but until now I just chalked it up to one of those random Access glitches.

The last several days we have been experiencing a flickering other behaviors noted in this post. We are at Version 2607 (Build 20228.20190)
There was a post about lines rendering in print preview the other day that seemed to be in Versions 2608 and/or 2609. I've been checking each time to see if an Office365 update snuck in. We're still at Version 2607.

Here is the link from Microsoft.  Build 2607 is fine.  Build 2608 is bad.

https://techcommunity.microsoft.com/discussions/access/access-2608-build-20326-line-controls-disappear-in-print-preview/4545366