The Google Chrome Browser (version 42.xx and above) no longer directly supports the Java platform. Pogo has been slowly converting games from Java to Flash for a while now, but unfortunately for us Pogo players, there are still more than a handful of Pogo’s games using Java technology. The Java games are shown on this games list — they’re the ones without the (Flash icon) next to them.
There is a temporary fix to enable Java in the Chrome browser, but it will only work until Chrome removes the workaround, currently estimated to be September 2015 or earlier. Type chrome://flags/#enable-npapi into the address bar of Chrome and then click Enable under “Enable NPAPI”. Pogo highly recommends you just use one of the alternate browsers for their games.
Update 9/9/15: Chrome versions 45 and above no longer support Java.