We need to investigate why "Verify Java Version" applet terminates right after it's started.
According to the log it looks like browser tab was closed (but it was not):

basic: Applet started
basic: Told clients applet is started
basic: Starting applet teardown
preloader: Delivering: ApplicationExitEvent
preloader: Enqueue: com.sun.javaws.progress.PreloaderDelegate$4@1c77c013
preloader: Stop progressCheck thread queue.size()=0
basic: Finished applet teardown
basic: PluginMain.unregisterApplet: 1 from mananger sun.plugin2.applet.JNLP2Manager@16133282
ui: plugin2manager.parentwindowDispose
network: JARUpdater: update check for https://java.com/en/download/JavaDetection.jar
cache: Resource https://java.com/en/download/JavaDetection.jar has expired.
network: Connecting https://java.com/en/download/JavaDetection.jar with proxy=HTTP @ www-proxy-ukc1.uk.oracle.com/10.254.202.93:80
network: Connecting https://java.com/en/download/JavaDetection.jar with cookie "s_nr=1426171687033; gpName=javac%3AVerify%3A8Try1_JRE_Homepage; gpChannel=javac%3AVerify; gpServer=java.com; JSESSIONID=2B83A68CF67C6AF752105F7B9F090F67; s_cc=true; s_sq=%5B%5BB%5D%5D"
network: ResponseCode for https://java.com/en/download/JavaDetection.jar : 304
network: Encoding for https://java.com/en/download/JavaDetection.jar : null
network: Disconnect connection to https://java.com/en/download/JavaDetection.jar

for now reproduced only for os x.