in a language i understand please wtf is a fabber and i can only build 3 unit types. a builder thing an AA one and a land one of any type
If you build a t1 fabricating unit from a t1 factory then that 'fabber' should be able to build t2 factories, but only of that one type e.g. the t1 bot fabricator can only build the t2 advanced bot factory.
Makes sure you've updated to v49186. Check the bug hasn't been reported befor, if it hasn't then open a ticket: http://pa.lennardf1989.com/Tracker/
Sounds like you got bitten by the same bug I did - quit PA, and reconnect to your game when it prompts you after logging back in. You should be able to move your commander around and build stuff.
I dont have this problem with the commander. its with the "Fabbers" besides i tryed your method multiple times and it dint work