Having the same problem this morning. I've got several non-standard sources installed as well, so I though that was the reason. I ended up disabling Wifi and just using Edge and it loaded up perfectly fine within a few minutes. I suppose I'm having difficulty connecting to my home network, even though the strengths shows almost full.
A lot of sources to refresh, and I'm sure not all sources are hosted on a DS3 backbone.
I suggest you use the elimination technique to see which sources slow the refresh process down. Pain in the rectum, but... it's either that, or wait forever for sources refresh.
My installer says " Could not refresh sources! " even though I have a full wi-fi single, and I removed every single source I had on there other then the AppTap Official, anyone run into something similar ?
This usually happens when you have too many sources or an unstable or weak WIFI connection. Check your router and also try and move closer when refreshing.
Yeah refreshing sources is an ultra pain. What's worse is trying to look for something in the all apps category without an alphabetical search function.