First off, please forgive me if this has already been addressed. I looked, and didn't see anything, but it's possible I could have missed it.
I've been having this problem for the better part of a week now, and I don't know if it's just me or if it is a site-wide (even patchy site-wide) thing.
When I go to autoprice items in my shop, it doesn't seem to want to load properly. I can go through the first few steps fine (albeit they take a minute or two, but I'm sure that's because I have close to the maximum number of items in the shop inventory), but once I reach the last step - where the prices are supposed to be applied to the shop items - it seems to hang. It will bring me to the page where I normally see the loading bar as it gradually applies my selected prices to each item, but either the bar doesn't move at all (and the number doesn't increase), or it goes PAINSTAKINGLY slow and still stops barely a fraction of the way into the autopricing. I've tried leaving the page open for close to an hour to see if maybe the connection is just lagging, but it never finishes. (It never even gets close to finishing.) I've attempted to autoprice on multiple computers, using multiple internet connections, so that can't be the issue. And now, each time I go into the autopricer to possibly attempt the process again, it seems to be adding onto the number of items it's preparing to autoprice. Most recently when I went in (because each time I go to the autopricer it tells me "It looks like you already autopriced, but it did not finish processing, click here to continue."), the number had jumped up to over 9000, when I know that isn't physically possible because there are maybe 2,100 items in that shop at the moment.
If I need to create a ticket, I will, but on the off-chance that this problem isn't only happening to me, I thought I might as well post about it.
P.S. This is a super duper hassle when, like me, you have a large number of items you're trying to sell, because there is no way I can spend the time to go in and manually price 25 pages of items. Believe me, I tried. I made it to about page 10 and couldn't take it anymore.

I have been able to use the autopricer, and I'm not experiencing what is explaining, HOWEVER I am getting a completely different issue.
I always load (as intended), select the New Price (Lowest) column, and finally autoprice. The thing is that it doesn't autoprice all my items to the lowest price. As you can see above, I had already autopriced, and those items didn't get their price changed, while others that are more expensive and others cheaper did. I am not sure if it's random items or always the same, but I just noticed a few days ago on another shop (but I had like 20 items so it wasn't much of a deal), but now I'm noticing it's on my main shop as well.
[edit] It's still happening, 4 days later. AND it's not autopricing the same items, plus a whole lot more now :/