The Play button was reported missing shortly after the latest patch in ViRo Playspace. A search party was dispatched and I'm happy to report we found it!
This was an issue in the networking backend having a name mismatch. One of our devs (I'm looking at YOU Shift-D) had the grand idea of sorting the items in the menu to represent when they released. He was all like "The newest stuff should be at the top".
Anyways, he managed to figure out how to sort things and was a happy camper. The dev didn't bother to check if the Play button was still there.
The Play button has returned to ViRo Playspace and the dev responsible for misplacing it has had his daily ration of a single cookie revoked.