I've experienced a couple of random errors in the Shop... However they have only happened in the Shop - Avatar - Items.
1. After entering the Items area - Flash 9e.ocx error which caused all my IE windows to quit.
2. Clicking on "Items" caused the Alteil game window to dissapear. (This occurred twice in a row - then worked normally)
In all 3 cases I was able to immediately log back in.
3. A third random error in Items... and had clicked the right "Next" arrow three times (to get to the Divine Favor Potion) ... and all my IE windows quit.
I haven't had problems in the Items area until yesterday.
(Windows XP Professional - using IE 7.0 - all current updates)
Once again, hope this information helps!