It appears that the restrictions on item trading may have been affected by the 10.1 patch. As I’ve mentioned in the bug report forum, the following scenarios have been observed:
Owner of a 421 Windscar Whetstone could not trade a 418 Irideus Fragment
Owner of two 411 rings was able to trade a 418 ring
Same ring owner later obtained a 424 ring, and then was unable to trade a 418 ring in a later dungeon.
Are these bugs or were the item trading requirements changed in the 10.1 patch?