Seems like it is a hosting related problem. Which plugin was added?
What elgg version were you testing?
I posted this too soon actually. I deleted the installion of Elgg and reinstalled. Once logged into the new installation I went directly to the Advanced Setting panel and realized I, myself, broke it by accidentally selecting the "Enable HTTPS logins". I don't have HTTPS set up on my server! Geez Louise. Anyway, I'll leave my post here, and my resolution, in case anyone else ever does the same silly thing I did ;o)
Thanks for the reply!
oh ok! Glad it was solved!
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