I got some problems with gpp 1.2:
Auto-wallwalk pitch doesn't keep its setting, I have to go to the menu -> options -> controls, and then set “auto wallwalk pitching” from yes to no and then to yes again, it keeps messing this up each time. A bit unnerving.
Also, gpp does not recognize any command-line options it seems. The script calling it does, depending on the context, make things like a <path-to-binary> +set r_customwidth 800 +set r_customheight 600 +set r_fullscreen false
or things. It perfeclty worked under 1.1, it is really annoying that it doesnt work now.