Like Rais stated in the post above me, this is a multi-core issue. You need to set processor affinity to a single core for Everquest. This will make it so EQ only runs off 1 core.
After launching the titanium client, open your task manager (usually accessible by ctrl+alt+delete), right click the Eqgame.exe process and click set affinity. Uncheck all of your cores except one (and make sure "all cores" is unchecked), then click ok and bring EQ back up, your problem should be fixed.
Alternatively, if you only have 2 cores, this will probably not be a series of checkboxes, but instead you will just click on "core 0" or "core 1".
You can actually set it to any of the numbers there, 0 is just the default ("first") core.
There is a way to automate this so you don't have to walk through that process every time. I know that Duxa's all in one has this option, but if you aren't using Duxa's, give me a minute and I'll get you the appropriate target script to make this automatic.
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