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I'm on Windows 8.1, 64-bit.
I'm not sure exactly how long it takes, but the overlay crashes after a couple of hours. I thought it might have to do with the number of session kills, as it seemed to have crashed when I hit 100 this last session, but I'm not sure. Achievement pop-ups still display, which is odd, but even restarting the game can't get the overlay to reappear; I have to start a new session in order to fix it.
You mean the HUD disappears?
Do you press Shift-F3 ever? That's the default toggle to turn the HUD on and off.
I suppose it's possible I'm hitting it accidentally, but I doubt it. I'd rarely have a need to press anything close to that combination.
If it happens again try toggling it with the key-press. Also go under Tools->Components, select the HUD to view its options and make sure it's enabled.
If you're getting achievement overlays then nothing crashed. The HUD works on the system the other overlays do.