files not displaying in Window menu

[mscholtz]

One of my files (and various derivative copies of it) are intermittently not showing up in the Window manu. I'm well aware that hidden files are behind the "Show Window>" menu item, and these aren't there either.

Anyone else seen this? A sign of corruption, possibly? (God, I hope not.) Or is there some non-bug non-corruption reason this would happen?

It occurs no matter whether the window in question or another window has the focus. If I spawn a new window from one of the files with the problem, the new window inherits the disease.

This doesn't happen all the time. When I first open these files they show in the menu as normal. Then at some point they disappear. Haven't yet been able to pinpoint when it's happening or what I was doing right before it happens.

See screenshot for evidence I'm not crazy.

TIA!