Me too. My custom script and application extension buttons keep getting replaced by buttons for random other buttons. VP14.0 build 211. Haven't reported it yet because I'm still not sure exactly what scenario causes it. Definitely a bug though.
That's not good. Maybe if you add them one last time since this update, they'll stick.
Yes, prior to your advice, I did this and yes they are sticking. This is still an unexpected User experience. IMO there is a Bug relating to Build Update to sustained ToolBar Script Icons. A User would not expect this to happen. I'm guessing that the coding that is responsible for compiling the ToolBar Scripts list has been banjaxed by the squashing of the previous Bug. "Tails" and "Chasing" comes to mind. Whats that game? Wacker-A-Mole?