Ok, got the error two more times while gathering disenchantables off the mailbox and while listing my enchanting mats to the AH. The first time, while getting my stuff (disenchantables) off the mail box I watched as my used memory climbed from an initial amount of 70 mb up to 170mb with ArkInventory taking the lions share of the increasing rate (in the range of +5-8mb) my usage dropped from the 170mb level down to 140mb or so with Ark's increasing rate also dropping (Note, I was not decreasing MY rate of gathering items from the mailbox) as my overall memory usage increased back up it hit 158mb or so I heard the tell-tale *ding when the first error hit. I tried the /reload ui tip from someone else posting here and the game DID NOT CRASH! My ui reloaded and my memory usage went back to the initial 70mb. I got the rest of my mats, disenchanted then made my way to the AH.
At the aution house while posting my mats, I had a rather large amount of Greater Nether Essence (77 units) and I post these individually (dont hate me for spamming the AH :)) with an eye on my memory usage rising past 140mb I see that ArkInventory's increading usage passing 8mb, then 11mb, then 17mb finally topping out at a whopping 24mb increasing usage before dropping back to 5mb and my overall memory usage falling from the 160mb level back to 145mb. As I continued to load items on the AH Ark started climbing again hitting only about 8mb increasing rate and my overall memory usage getting to 155mb and I get the error again. I continued to post the rest of my mats and upon completing that task my memory usage was up around 198mb. I tried the /reload ui tip again but this time the game crashed...but here's where it got wierd. I did not get the windows error message nor did I get the Blizzard window asking me to send the error to them. First time that hasn't happend with this error.
I hope I didn't waste my time in posting this and I hope your time wasn't wasted in reading it.
I get the same exact errors as you guys are getting. It happens on a disenchanting alt 3 or 4 times per session. All I do with this alt is buy items on the AH, anywhere from 70 on a slow day up to over 200 items on a Monday. The error will occur at the mailbox as I gather the items...I DE them as I gather the items and the error always occurs when DE'ing the items, sometimes 3 or more times depending on how large my inbox is. I use ArcInventory and Auctioneer Advanced. I will also get the errors when posting my enchanting mats to the AH. If I have a full bag of enchanting mats it always procs, but I can continue listing the items. then I just /quit to leave the game. I haven't noticed the memory usage at the time of the crashes but I will the next time it happens.