Hey,
That sounds pretty cool.
I think the problem might be a proxy at your workplace timing out connection that gets the community wallpapers.
I can try to extend the timeout/keep-alive in the next version to try and prevent such a problem - which i'll do, but effectively I don't think its a 'real' issue.
I may also add a killswitch in the config to turn off network functions so any user who wants to just use it without those features have a way.
More information could be helpful, especially if others are having the same problem. Details like o/s, network configuration, any vpn's or proxies you know about could be useful.
If you use a stopwatch and find from the time of launch to failure is close to a round number like 30/60/120 seconds, it might give more evidence that its a timeout.
I can definitely offer a fix, if we can understand why its happening or help me recreate it myself.
Do you have any problems loading these urls in a browser? How long does it take to load them?
http://windowbox.me/multiwall/community/view_top.phphttp://windowbox.me/multiwall/community/viewer.php