Then I don't know what it else could be.
I know the shell v3.46 works with some limitations (internet functions, camera selection a.s.o.). But it runs on different PCs (32 or 64 bit, XP - Win 10).
The program code is very extensive and complicated. Only whim has a chance to manage this code. For the development of CHDK it would be better if we had a new and simpler compiler GUI, e.g. download the recent sources, selection of cameras, compiler options and ready.
msl