So far, this only seems to happen with All The Things, not other addons I'm using. Screenshot is attached.

This worked fine prior to the 10.0.x release.

This may have been fixed by AllTheThings -- I've downloaded their latest code on GitHub.

I'm not certain whether this fix is in the officially-packaged release or not; the latest file timestamp is after the last official release. But I think this may not be an ElvUI issue after all.

Strange, I haven't seen any other reports of this happening with ElvUI, and I've seen ATT working fine with ElvUI at least this whole last week. Will consider this fixed since it's working for you now as well.