PS CS4 canvas disappears

I've been experiencing this weird bug with CS4 where the canvas somehow gets minimized or just somehow disappears while all the tools and even layer . This becomes an issue when you are trying to close out photoshop and you are asked to save the document. You are unable to verify whether changes have been made or if anything has shifted since you last viewed the doc. Anyone else experience this or have a solution to prevent it from happening?

It happens to me sometimes too. Like just now.
Buko, when you are in Finder, say, and you want to shut down the computer and click onto Photoshop (i'm on an iMac 2.66GHz Intel Core Duo) with open docs minimized down in the dock you want to maybe save and quit, or don't save and quit, or undo a couple steps and quit, they just disappear.
They are shown under the Window menu at the bottom like normal, but are nowhere to be seen onscreen. You go to Quit and a dialog comes up "Save changes to whatever.doc before quitting?", but you can't get to the document in order to know. So you have to save changes hoping to hell you didn't flatten an image you'll need layers for later or something. Or vice-versa. Infuriating. Is it some keyboard shortcut? If it helps, this happened when I cmd-tabbed to select Photoshop from my open apps.
Apologies if this is addressed in another thread.

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