My mental model of what's going on at Groundspeak (black box with interesting sounds coming out) is that they've lost access to the source code for the Browse Map.  Contractually, operationally, dunno, I'm speculating.  So they built a new one.   Probably, a change to some shared code (the title bar module, say, or low-level support code) accidentally broke the Browse Map without anybody even touching the latter (bit decay).  Reverting a bad change is easy, but I'm assuming they didn't