An issue that is random and is hard to reproduce. Needs further investigation
There seems to be a problem "Mark Alert as Read" in Tomcat 7.0.29.
This appears to be a problem with DWR that has been kind of mentioned in the IRC, but has not been ticketed, probably because few people are using Tomcat7 and the issue is sporadic. Currently happening in Firefox 14.0.1 and Chrome 21