I communicated with my host and they verified my environment was PHP 5.3 and the other requirements were in place (see the requirements under the release notes at: www.limesurvey.org/en/stable-release)
Then my host did something interesting, instead of using the full URL to my site which I've always used that will look like this in your browser
/fakepath to your site's directory/index.php/admin/authentication/login
He truncated and used only
/fakepath to your site's directory/index.php/admin/
Doing this revealed a request to update the limesurvey database, where he selected Ok. After that, the proper log in window displays fine.
For my situation, I never saw that update database window, and I believe that was the source of the issue: the database wasn't updated to the current release.
I'm posting these details in hopes they might help someone else who does the update and they see the white window.
Thanks as always to the Limesurvey team who continue to do great work and help out whenever they can.
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