@willco noticed something odd about the SDK installer on Windows--looks like it merges the new files into an existing SDK instead of replacing them, which can leave gunk behind (namely, old pdex.bin files that shouldn't be in source folders any more). Can you try moving your current SDK folder aside by renaming it, then install a clean copy of the 2.0 SDK folder and see if that changes anything? I'm not sure what else would be causing those errors.. We didn't change the version of the ARM toolchain in 2.0. 
If that does work you'll likely then run into this issue: SDK 2.0 can't build C examples for the Windows Simulator with NMAKE unless, due to pdc not checking for a pdex.dll file. 
But adding an empty main.lua file in the source folder will work around that until we get the fix out.