I've loaded the Beta version into a v04.06.00 test site, running IIS v5.1, xp pro, asp.nev v2.0, and sql2005. I've been testing on a variety of feeds (not done testing though), and I've loaded 4 feed modules on the same page, each using slightly different settings. I've mixed the Ajax setting, 2 on and 2 off, and am using different xsl settings.
To this point, I see improvement in the rendering, including using the news source Jan mentions. It renders fine, with the exception of a non-localized date format, but that wasn't a 'fix' for this version, the date business requires more localization work, so I don't think that's an issue with this version 'fix'.
I'm not sure why Jan is getting that error, perhaps he could give us some details about his setup and configuration. One note on installation, I did attempt to 'upgrade' the module by installing the new beta version over an existing version. This did not function, and got module could not be loaded errors. So, deleted all News modules on the site, stopped IIS default web site, took the database offline, and deleted the News folder and contents from the /DeskTop Modules folder. Then, started everything backup. I installed the module and it came up without issue.
So far, testing is going good. However, some might want to try the 'upgrade' process themselves on a test site, to see if that works for them. It did not work for me, although I'll test it again later. Now, I'm testing the beta version on a variety of different types of news feeds, and will report progress as time permits.