11.2.0.2.0 dbcontrol - performance tab does not load in Firefox, Chrome, Safari but does in Internet

 We're doing a bit of testing in 11.2.0.2 (on Linux x86_64) to see if we can possibly consider upgrading from 11.1.0.7 but found during the evaluation that Enterprise Manager dbcontrol (not Grid) does not display the Performance tab when using our preferred browsers - IE is not a valid use case since our standard OS is non-Windows.

Has anyone experienced this if using 11.2.0.2? I have to believe it's something odd with Flash and Firefox/Chrome but what's odd is that dbcontrol shows the performance tab just fine in 11.1.0.7 and the couple 11.2.0.1 environments. Upon clicking on the performance tab the page just shows the "Initializing" progress bar and does nothing.