So a friend of mine bought the 757 (A little too small for me at times, personally I fly the another company 747) and he encountered issues.
Perhaps he should have been posting or submitting a ticket but I am not quite ready to wait a long time just to get a general answer back like: "Try to press the CMD on on the autopilot" etc.

So anyways I got a call where he asked me to come over and see if I could make any sense out of the 757, after all I did know the 747 so I thought: "How hard can it be?"
I dropped over and dived into the FMC which was fairly similar, but snappier (On the another company the moment you hit EXEC it blacks out for a second or two) and programmed a test flight the same way I would program the Queen.
Only thing I partly failed at where I googled was the CG part and entered 40 and set the trim to that value (Got me off the ground anyway)

However, the problems with the autopilot starts after take off.
Following my 747 procedure I hit the AP center button and LNAV and VNAV expecting the autopilot to track the programmed FMC course.
However, the autopilot doesn't do that, with Flight director armed and Autothrottle armed, I do lose control over the stick and thrust levers (I can shake the Queen out of it, but not the 757)  but after departure from ENGM the aircraft goes into a steady 5 degree bank to the right and stays like that for... FOREVER or until its tanks are dry, disregarding any input.

Only thing it partially listens to is altitude but that is sometimes correct and sometimes not.
The autopilot will also overspeed the jet by not reducing thrust, and I cannot override it without disabling autothrottle.
Furthermore, I also tried the heading selector knob, I set it to a heading that was different from the aircraft's present bank and right clicked the button (Same procedure as the Queen) but nothing happened...
The autopilot stayed in its 5 degree bank in a very very very wide holding pattern.

So my question is, am I missing something on the 757?
A switch to make it listen to the FMC rather than some other source or have we faced a strange bug?
For reference we have tried reinstalling it a couple of times, to no effect and the issue seems scaringly familiar to what the other guy here on this forum have experienced.