Hi Andria,
It sounds like when you install mojoPortal you are copying it from an existing installation. If you are doing that you should
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delete the /Data/currentlog.config file
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delete the contents of the /Data/Sites/1/index folder
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you can safely delete the /Data/systemfiles and /Data/Sites/1/systemfiles folders, they will be re-created
This is similar issues to moving a site to a different server.
If you'd like to send a darker GridView theme I'd be glad to include it.
Best,
Joe