I've noticed an odd behavior the past few days: when I launch InDesign, it will start up with no palettes open. I hit Tab, thinking that they just got toggled off, but that doesn't do anything. I typically use the [Essentials Classic] workspace and it just doesn't seem to be working. I can click other workspaces and those palettes will pop up, but when I click back to [Essentials Classic], the workspace doesn't change.
I've found that [Advanced] is kinda close to what I use, so I've been defaulting to that lately, but not sure what's going on otherwise.
As InDesign launches perform this sequence Delete InDesign preferences with shortcuts You can delete the replaceable InDesign SaveData and InDesign Defaults files by holding down the following keys while InDesign is launching: Windows: Shift+Ctrl+Alt Mac OS: Shift+Control+Option+Command