From my experience on this and other forums, problems with Virtual Remote
Controls come down to 3 basic questions:

1. When I run the Video Source
   set up my Cable/Satellite/DVR device is not supported.
2. My On-Screen Remote control
   has no effect on the device.
3. My On-Screen Remote has
   suddenly disappeared.

 Let’s look at each of these questions in turn:

 1.   When I run the Video Source set up my device is not
supported

 The first thing is to make sure you try all the models associated with the manufacturer
of your device, as most manufactures use similar code sets across their device
range.  Also make sure you select the ‘Other’ option under your
manufacturer and try all the codes.  And if it is applicable, try your
provider as well.  For example, Comcast tend to use Motorola boxes so try
all the options under both Comcast and Motorola.

 If none of the codes work then you are going to need a Custom Remote. 
Now quite a few of these have already been built and have been stored in 2
areas:

http://placeshiftingenthusiasts.com/forum/remote-file-downloads/

http://www.hifi-remote.com/forums/dload.php?action=category&cat_id=87

So check there to see if your device, or one with a similar name, had been
produced.

If your device is not there then post a request in this forum, under the ‘TV
Source Setup’ or On-Screen Remote Control' category with the Manufacturer and
Model Number of your device in the Subject Line asking if someone could build a
Custom Remote or recommend a matching device.  And please confirm in the
body of the posting that you have carried out all the above checks so we do not
just redirect you back to this post.

 If that does not get you a working Custom Remote then check out Remotes.slingbox.com. 
That site might allow you to build your own remote.  But note it does not
support the ‘Classic’ Slingbox and you have to be at the same location as the
Slingbox to make it work.

2.   My On-Screen Remote control has no effect on the
device

 There is a very comprehensive list of checks to make at Advanced IR Blaster
or Onscreen Remote Control Troubleshooting so first work through those.

Note:  If the device you are trying to control is a DirecTV or a Dish
Network box then both these allow for multiple Remote Addresses so you have to
make sure your select the correct address (The normal remotes assume the
default address).  Some of the devices have built-in remotes for some
alternative codes, but if yours is not included (and you cannot change the
address to one that is supported) then post a request on the forum, giving the
device and the address.

 Some of these also use RF for their systems so make sure you have IR
selected for the output you are using.

 If that doesn’t help then it might be the wrong codes being sent. 
Check out the answer to Q1 above and see if using  Custom Remote helps.

 If all that fails then post a question on the Forum but again make sure you
mention you have carried out all the tests described in this post.

 3.   My On-Screen Remote has suddenly disappeared.

First make sure you have actually selected ‘Show Remote’ on the web-based
player, and/or tapped on the Remote icon on Slingplayer.

 If that option is greyed out then rerun the ‘Setup Video Sources’ to refresh
the details in the Slingbox in case they have been corrupted.

 If you do not get a list of manufacturers showing up, or you get a message
along the lines of ‘This Slingbox was not designed for use in ..<your
country>’ and this happens regardless of country then your box has probably
failed and you need to contact Sling Support.

 If that does not help try resetting the Slingbox and starting again from
scratch.

 If that fails then post a question on the Forum but again make sure you
mention you have carried out all the tests described in this post.