Did you install the EQ2Maps to your "Default" UI directory? If so, that would explain why they worked before, and now they don't. (Did you notice several files being downloaded in the launchpad just before you logged into the game and the maps stopped working?)
If you don't already have a custom UI directory, EQ2Maps should have installed itself into an EQ2Maps directory it created in your UI folder (IIRC).
Anything installed to the "Default" UI directory will be overwritten and/or disabled every time the launchpad runs, so any custom UI bits -- including EQ2Map -- should be saved in a different location.
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