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 When you switch "window modes" (I'm sure there's a better term) it breaks Titanium.  For instance, in newer versions of Windows CTRL + ALT + DELETE doesn't just open a window in the same mode, it switches your entire screen, and that will break things.
 My guess is that what's happening is that your screensaver/power-saving features are changing the "window mode" and breaking EverQuest.  You might be able to recover by entering/leaving full screen mode (CTRL + ENTER), but a better solution is probably to set your screensaver/power saving settings to not start for a longer period of time.
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