Beta version is so stable that new betas or bugfixes are not required. There are some minor bugs, but nothing critical.
The worst bug of Radmin Viewer 3.0b is "losing keyboard focus", the situation that can be fixed with two mouse clicks.
More serious bugs were NOT found or reported.
This is simply not true. I have reported the Radmin Viewer 3.0b client completely crashing on me because it encountered a break point, but there has been no release as of yet to resolve this problem.
Now I do not encounter this problem often, and I can usually rerun the Radmin Viewer when it happens, however it usually happens at the worst time.