recently picked up a useful tidbit from engineering on a Flash Player optimization setting that can be helpful when using the vSphere Web Client or any other Flash web application for that matter. The particular setting is the Website Storage Settings which controls the amount of temporary data that can be stored by the Flash Player on your local disk and by default this is limited to 100Kb. This limited storage footprint is actually done on purposes as a security feature of Flash.

However, at some point the Flash Player will reach this limit and prompt the user to allow additional disk space to be consumed and this is where you may see the vSphere Web Client crash and you would to go through the motions of logging back in.

--> Please see the rest at : http://www.virtuallyghetto.com/2013/11/quick-tip-useful-flash-player.html