Same issue here folks (cannot read memory error). I have changed absolutely nothing in the last 24 hours, and I was able to play last night and not able to today after the downtime.
Could this have something to do with the .dll that is unique to P99?
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Edit: Tried the eqclient.ini window resolution fix that was suggested in an earlier post (with link). Didn't work, so additional information: Windows 7 x64 and running as admin w XP SP3 from shortcut. No driver updates since last working, no windows updates since last working, no hardware changes since last working, and no new programs installed since last working. Error appears after entering login information; when it would normally load server list, instead there is a hang then error message forcing the program to terminate.