You have the right idea with using the virtual remote to bring the DirecTV box out of sleep mode. You should be able to do this with any version of our Slingplayer software.
Which Slingplayer software are you using (iPhone, Android tablet, etc.)? I ask because some of our software will not pull up a picture of the remote. For example, our iPhone and Android phone software will pull up a series of menus at the top of the screen, through which you have access to all of your virtual remote's functions.
I took a look at your account to see that you have a Slingbox 500. If you are able to try the virtual remote, but it does not work, take a look at this article:
Hope this helps!