After upgarding to iOS 6 I experienced the same crashing while try to view purchased apps on my iPad2 wifi+cellular. I tried resetting Network Services last night as suggested earlier in the thread, and that didn't help. I noticed at work today that while using cellular, my Purchased function appeared to work, albeit slowly. So at home tonight, while Purchased still crashes after "loading" for 60 seconds when connected to wifi, if I turned wifi off and used cellular, the Purchased function worked, again slow to retrieve my thousand or so apps.
So I turnped off wifi in Settings, started Purchased up in cellular, and after the list of all my purchased appeared, I switched to Settings and turned on wifi, and after connecting, switched back to App Store Purchased list, which still was there, and downloading icons as I scrolled, etc. seemed to still be working, downloading, etc.
So then held my breath, I killed the app, restarted it in wifi. And now it seems to work every time, again slow to retrieve my apps, but that could be the fact I have so many, or some other server problem, etc. It seems to me the entire app store is slower now under iOS 6.
But for now, it appears my problem has been resolved. If you have this problem and have the cellular version of the iPad or an iPhone, then give it a try. If you have only a wifi iPad or iPod then this "fix" is of no help to you. Sorry. It does seem to be a wifi connection problem of some sort. Try going to another wifi source such as Starbucks or McDonlads and try connecting to Purchased in the App Store. Maybe it only tales one time for it to get unscrambled.