Don't know if everyone is aware of it, but I maintain a webpage with a summary of the known issues in 4.2.0 that have been discussed here on the mailing list, and links to the patches that I have produced since the release.
So the first place to go if you have problems with 4.2.0 is this page:
http://www.hswn.dk/hobbitsw/patches/
There's also a link from the "Hobbit projects" menu on the demo-site.
So far I am very pleased with the number of bug reports after the 4.2.0
release. There's been 385 downloads of that release from sourceforge
until now, and with only 5 bugs reported it looks to be pretty good for
a dot-oh release.
So you've all done a good job with the pre-release testing.
Regards,
Henrik