Hi Don,
I would like to politely disagree with you on this.
These are not bugs that they did not get time to fix, they are new bugs that were created when they tried to fix other issues.
Poor regression testing on their behalf is the main issue, it took me 5 minutes to find these new issues.
The WPF viewer is in its 10th release in 3 years and should be stable by now.
SP4 was quite stable and mostly bug free and is the version I am stuck on as every subsequent release has had issues that have made it unusable in a production environment.
Thanks
Anthony