src bundles in the distribution of TC 5.5.27 include *.class files. Those should not be there. Also, as I understand, those ones in .tar.gz archive have gone through fixcrlf filter and are unusable. I can reproduce this issue with current tc5.5.x using Eclipse IDE as the development environment. (The classes compiled by the IDE are the ones that are packed there).
I prepared patch and proposed it for 5.5.
Fixed. Will be OK in 5.5.28.