EMC error reporting, radius compensation

I am using the EMC system and I'm trying to debug
a GCode program. When I open, and then verify my
program, EMC may report errors but it doesn't give line
numbers or any context for the error. Is there any way to get more
details on the errors?

Also, I'm finding that after modifying my program, saving the file,
doing an Open in EMC, then verify - the first error it reports seems
to be a leftover from the previous version of the program file. Clicking
Verify again gives me fresh errors.

Finally, does anyone have a simple program that uses G41 or G42
to do cutter radius compensation? This is what I'm trying to
figure out.

Thanks
Art