Another service pack for ArcGIS 10.0 has recently been released. However, previous service pack releases have introduced problems and instability along with fixes. Have there been any reported bugs or known stability issues with the latest service pack release? Also, what are the pros/cons of upgrading to ArcGIS 10.1 over ArcGIS 10.0 SP5?
This isn't a good question for GIS.se and it should be moved (which is different from saying it's not a good question). Within the GIS Stack Exchange framework the best place for this question type is in Chat, creating a new room is straightforward, just make sure to GIS is in the Related Sites so people find it.
As for reported bugs and issues:
A list of known issues is maintained at http://support.esri.com/en/content/known-issues. It's a subset which has gone through a validation process plus some other ranking system (or two).
A search of the support site with keywords like sp5 nim with the omitted results filter off will return something akin to "list of known issues with service pack 5". (NIM is short for Nimbus ID.) It will only include issues which have been confirmed and reproduced in some fashion. Each result has limited detail, basically a 1 line summary with date submitted, applicable products and versions, and so on. So it's not much, but definitely better than the resounding silence of a few years ago.
At one point only those logged in with a (free) Esri Global ID could find or read the NIM reports but that doesn't seem to be true now. Perhaps it depends on the class of the NIM.
I've long thought it would be beneficial to have a public place where people could submit and view issues/bug reports as is standard with open source projects. This way we could see and perhaps help with those nebulous issues that are hard to pin down and never make it to official bug status (e.g. see the long running Desktop ArcGIS 10 Really Slow thread). Perhaps we already have this with http://ideas.arcgis.com (?)