>>>>> "Raymond" == Raymond Toy <toy(a)rtp.ericsson.se&gt; writes: Raymond> I think this really is due to an invalid bytecode. As a quick test, I Raymond> removed all of the elc files for eudc and re-did the test. Everything Raymond> works as expected! Raymond> My eudc files were obtained from the 1999-07-29 sumo tarballs. Raymond> I'll try recompiling these files with 21.2.19 or perhaps some other Raymond> version. (Has the byte-compiler changed between 21.1.x and 21.2.19?) That was it! I byte-compiled all of the eudc files with 21.1.7, and everything seems to be working again.