Ifly 737 heading display problem

I am using Linda with the MCP Combo 2 and Ifly 737. Everything appears to work OK except the heading display on the A/P. The figures on the Combi display and the screen A/P display move when the knob is turned but they do not correspond with each other. I am using Linda 1.11, iflytofsuipc 2.03, Ifly 737 3.1 and fsuipc4 4.924a.

Can anybody help please,

Thanks,

Richard Halton