Using Sybase Central from 12.0.1 against an 11.0.1 database leads to the effect, that the "overview" is not usable, as a message appears:
An error occurred while refreshing the data: Table 'sysmirrorserver' not found, The refresh has been stopped.
This leads to the effect, that the overview page shows nothing. My suggestion would be to just check for the exitstens and if the new feature is not available in the database just skip this section of information, but still show the rest of the overview.
This is actually a bug - you are correct, this operation should not have an error associated with it.
Thank you for the bug report.
Edit: This issue has now been resolved in CR #691736, in builds 184.108.40.20614. I have made a Windows x86/x64 request for this EBF.
If there are other known and well-defined (reproducible) bugs to submit, you can always submit a free bug submission technical support case via Case-Express: http://case-express.sybase.com/cx/