So, I left GPS Test running for 4-5 hours at the office today, with the only results being the same as usual (1-2 sats at best with no lock). I gave up, packed up my tablet, and left it alone for the afternoon. This evening I tried it out again in my dining room, and boom! 7-17 sats (inside!) with a lock within 30 feet. I hope it is a permanent thing; maybe there's some sort of burn-in process on some devices? Glad I may not need to consider a return, if it lasts.