Plugin CP page causes white screen
Brad, Thank you again for your help.

I found the problem, although I'm not sure of "why". In my service file, I have this line:

$email-&gt;body = craft()-&gt;templates-&gt;renderString($settings-&gt;welcomeEmailMessage, ['firstName' =&gt; $contact-&gt;firstName]);


After digging though log file(s), I found the error. "Unexpected '['"

It needed to be this:

$email-&gt;body = craft()-&gt;templates-&gt;renderString($settings-&gt;welcomeEmailMessage, array('firstName' =&gt; $contact-&gt;firstName));


Because everything was working perfectly on my local machine, (newer version of php) I wonder if that's the root cause.