Calling a Program from Home Page. What's Wrong

[Snorre]

That's strange:
I've tested

Code:

EXPORT P2RN(a,d) BEGIN COS(a)*d END;

on both (device + emulator: 6940) and it worked as expected.
Is there any other program on your calc which has defined an exported variable or function named "P2RN"? You may try the full name: <PROGNAME>.P2RN(...).