Yeah, I've done it before, just for some reason now, I'm getting completely random results that match nothing in the adjacents. Though, I hadn't heard that your step counter is saved when you turn of the game.
I'm not aware of any issues with dust spot RNG, but I haven't actually tried it myself. I assume you know, but walking around affects your PID frame and if your step counter (which is saved with your game) reaches 128 (256? Can't recall right now) it will increase your IV frame by the number of mons in your party. In case you're triggering your step counter, you can walk for a bit and then save again and retry.
I'm pretty sure that religiousjedi (often in #smogonwifi) has successfully done dust spots, so you might try checking with him. If you're still having problems, give me your target seed info (screenshot of the inspector is probably easiest) and details of what you're getting and I'll take a closer look.
Oh sorry, I hadn't seen your response :( anyway, I did a little research on my own and found out that occasionally if a program crashes and you try to re-open it, it won't load or something, so all you have to do is turn the compute off. I don't think it was a problem with pprng in retrospect as much as I just trying to run too many things at once.