An error occurred while attempting to change modules

I installed Lightroom and when starting the program I get, "An error occurred while attempting to change modules." I get this message within the program when clicking on any of the top right menu items. Also, importing a photo is not listed in the file menu. I deleted the preference file and Lightroom folder in my user preference and reinstalled. I tried many reinstalls, it still has reoccurring error message. Anyone now a fix? I'm running 10.5 on a Core Duo with 2meg of RAM on a 320 gig hard drive with lots of room.

For what it is worth, I was unable to change to the Web and Print modules, and I was also unable to record new presets (though I had successfully done it many times before) though I could still use already created ones.  I was baffled, but found a workaround using hints from this and other forums.  Much thanks to those who provided me with a starting point as I never would have figured this out on my own.
My wife is a separate user on the same computer, and I tried switching our catalogues and preference files, ... nada.  Looking at her folder structure under user/library/application support/adobe/lightroom, she had folders for Web Templates, Web Galleries, and Print Templates but I didn't.  So, simply copying her folders (not creating new ones of the same name, which may still have worked) into my own lightroom directory worked. 
Where I screwed up initially was tryiong to use my own presets under her install of lightroom and then creating new ones (which worked) but then trying to import them back into mine.  I had the new presets working under my own install, but still couldn't create new ones under my own setup.  Finally, I realized that it was the "Develop Presets" folder under my own install that was in some way corrupted and copied her Develop Presets folder into my own install and every thing was fixed. I could even copy the subfolders from my own Develop Presets folder directly back in without issue.
Hope this helps someone.

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  • An error occurred when attempting to change modules.

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    Hi, I¹ve been through it again to ensure I¹ve not forgot things. Completely
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