My phone was acting weird this afternoon. I forgot what app I was on but it got stuck so I did a soft reset. When it came back on, a lot of the apps became non-functional. Some were apps installed on the SD card, some weren't: (Bing) News, Sports, Music, Podcast, 6tag, etc etc. Also it seemed to have trouble connecting to a lot of app servers, like eBay. I was really frustrated and since it affected non-SD card installed apps, i knew the only solution was to do a HARD reset. (This after turning the phone on and off, plus soft resets several times to no avail.) After SEVERAL hours (no joke) of reinstalling everything, voila, now i have Denim on my 1520! I haven't checked out all the functions yet, just want to let you guys know for now.
Oh, and I'm running 8.1 developer preview.
Oh, and I'm running 8.1 developer preview.