Steam Overlay sometimes fails to open

[dranelol]

Not quite sure of the repro steps for this, but I've noticed at times while playing a build with the steam integration active, the overlay will fail to come up (using shift+tab); I find that this occurs more often when resizing the game window, or moving it between monitors.

I've got logging active for IsOverlayEnabled, but this seems to always return true once the integration has connected to steam, even if the overlay is not currently available.

Is there a BETTER way to determine if the overlay will come up? Is there some way to reset it if I figure out that the overlay has become inactive?