Hi，
Normally CW4.6 project can be opened and used by CW5.1 without problem.
I have several project that were created under CW4.6 and now I work them with CW5.1. No issue comes out.
I wonder your problem is very specific, I suggest you check:
1. check compiler,linker setting. if CW5.1 version project is as same as CW4.6 version project.
2. check generated map files. is there any file/variable missing/change in each of the version?
3. if both 1 and 2 steps are normal. I suggest you set breakpoints at the places where the problem will going to happen and check the problem in debugger view.
Have a great day,
Jennie Zhang
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