I have been using both the Petroleum Fluids Pac and the Advantage Pac on my 41CX. When I use the ROM functions of one of the Pacs, it affects the registers used by the other.
For instance, after using a base conversion function from the Advantage Pac, "IN2-M2" appears on the Alpha register. Similarly, the Z factor function corrupts registers allocated for matrices with null characters. And one day, after using the unit conversions of the Petroleum Fluids Pac I tried to solve an equation with the Advantage Pac. The calculator "froze." I turned it off and then tried to turn it back on. It refused. Only a memory reset brought it back to life.
I am the original owner of the calculator and never had a problem like this before. By the way, battery contacts were clean.
My question: is there an incompatibility between both pacs? If there is one, does it cause register corruption or a system crash? How dangerous it is?
Thanks