Steam Overlay Not Consistently Working

Cross-posted from Steam forums as I wasn't sure on whose end this problem is.

So besides some other issues that have already been beaten to death since release, I've been having problems getting the Steam overlay to consistently work while playing. It seems it'll only work if I actually hit Shift+Tab when the little informative prompt shows up; if I miss it or don't, I basically won't have access to it for the entirety of my session.
Not the biggest deal but I use Steam as my main IM communication and with PN2 the games are taking much longer to play so it's annoying to have to Alt+Tab out (pausing the game instead of letting it run behind the overlay) to type little responses.

Is this a problem on my end? Telltale's? Steam's?
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