Strange behavior of HP-41CV with Math PAC and IR Printer Module

[Michael de Estrada]

I have an HP-41CV with the Math, Stress and Structural Analysis PAC modules installed. When I run test problems for the Math PAC POLY (Polynomial Solutions) program without the IR Printer module installed, I get the correct results. However, when I install the IR Printer module, the results are completely incorrect. As soon as I remove the IR Printer module, the results are correct again. The SIZE parameter is set high enough for the requirements of the program. Has anyone encountered this problem, and if so, do you know what is the cause ?