Hello,

Now I testing an official SL 4.2, but some miner bugs could be found here.
As for "Bug Tracker" at [SL-Bugs] Issue Collector
https://www.scientificlinux.org/collector.2004-08-03.0265953686/collector_contents :
Topic for SL 4.2 is not seems to be ready, so in the meantime I will post them for SL 4x.

Regards, Green.