I have heard that others are experiencing this problem as well.
Beginning yesterday (6/5/2011) I began experiencing an issue wherein attempting to zone into any instance results in a came crash during the zoning process. I have heard that others are experiencing this problem as well. In more recent content, such as Rise of Kunark, Shadow Odyssey, and Destiny of Velious, I am in the instance on logging back in. However, when going into older content, such as the Poet's Palace from Desert of Flames, I am always kicked back to the parent zone (I.E. Shimmering Citadel) which is inhibiting my ability to clear out older quests I have requiring entry into that content. If there is already a thread on this topic, then I apologize for not having located it and placed this post there. Please point me towards that thread if it exists, so I can see what others experiencing this isssue have tried to resolve it. Thank you.
As an addendum to this post, the severity of the issue has expanded to the point where I now cannot even log into any of my characters from Character Select. The game stops responding and I have to close it. Please, someone, tell me there is a solution to this problem forthcoming. I have done a forced repatch of the game thus far, which has not made any difference.