Same problem - I am using Chrome on a 64 bit Windows 8 machine. Tried in Mozilla and Internet Explorer, I can get all the way to the new pop up slingplayer and make the remote control appear, however, when I press any buttons on the remote control, nothing happens. Therefore I can't power on my television remotely. I even tried downloading a new Java version and following the NAPI enablement since I am running Chrome > version 42.0. Nothing.
Previously, I was streaming directly from the slingplayer on the website but now when I go to watch it tells me I need to download a player. When I go through that process is tells me the player needs windows 7 or higher to download. What can I do so that I can access my slingbox? My browser is Google Chrome if that means anything and my laptop is Windows Vista. I used the player fine this morning but tonight I ran into this problem. Please help!