Sorry to bump this old thread but im having almost the same issue and cant figure the post out correctly. 

I'm using: haas vf-tr series 5x mill pst 

My B axis is posting out b-90 a90 when it needs to be b90 a90 i tried messing with the integers and it works only on the B axis then it will post my A axis at A-90 and all my Y axis movements are y+ needs to be y-.

Using TRT-160 A,B platter. 

Why do you have to set it to system origin? You cant just make your own origin for this? 

Here is my file. 

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Are setup correctly on the has trunion. Is this an older one were you need to figure out were the center of rotation is above the platter? Some wereason between .1 and .16 or so.  So this is always origin? 

C/L of rotation is 2.00" above plater, i have that set up. 

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He just shared nothing.....his positions off...great, where's the file....my guess is he either doesn't have the WCS/Planes set up right OR he is using an unproven post that is not yet set up for his machine....another possibility is his part is not set up in the correct orientation for his machine.

but all we know to this point is he gets wrong output from his post  

It is an unproven post the most generic post that comes with mastercam. Again self taught on this dont know how to edit posts. Part is orientated correctly for the machine otherwise the rest of the program would of been junk. 

ANY INSIGHT ON WHY MY BASIC POST AND THE FUNCTION 5 AXIS DRILLING DOES NOT POST OUT CORRECT? IM USING GENERIC HAAS VF-TR_SERIES 5X MILL. WRONG X,Y,A, AND B'S. IM PROGRAMMING OFF C/L ROTATION. IM 100% SELF TAUGHT LAST 5 YEARS. 

LET ME KNOW WHAT YOU GUYS THINK I CAN SEND YOU MY FILE.