~-|**|PrettyHtmlEnd|**|-~ end group e-->Hi Matt,

The cause is listed there in the output:

ImportError: /home/matt/op25/blocks/src/lib/.libs/_op25.so: undefined
symbol: _ZNK4ldu115destination_strEv

Its a bit cryptic but what its saying is that the code is referring to a new function "ldu1::destination_str()" which isn't in the block you are linking to at runtime using "make check". I guess you added this function to the ldu1 class but not in the ldu1.cc source file?

Stevie