Login Issue

A few weeks ago my server crashed and they had to bring back up and reinstall php, etc. Ever since then I've had a login issue which I'll describe:

Login at admin login page and it immediately goes to a blank page. If I just go up and reload the blank page it then goes to the admin dashboard like it's supposed to. What would cause me to have to reload this blank page? Any ideas??

I'm still thinking something wasn't reinstalled correctly after the crash, but it seems to be working okay, although it does seem a little slower now.

Do you see any new records in server error logs?

Here's some thing from the error log, see anything I can fix there?

[02-Oct-2018 19:40:29 America/Chicago] PHP Warning: strpos(): Offset not contained in string in /home/XXX/public_html/store/app/functions/fn.common.php on line 2137
[02-Oct-2018 23:45:09 America/Chicago] PHP Notice: Undefined index: in /home/XXX/public_html/store/app/functions/fn.database.php on line 493
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REQUEST_METHOD in /home/XXX/public_html/store/app/Tygh/Registry.php on line 510
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REMOTE_ADDR in /home/XXX/public_html/store/app/functions/fn.common.php on line 1919
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REMOTE_ADDR in /home/XXX/public_html/store/app/functions/fn.common.php on line 1919
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REMOTE_ADDR in /home/XXX/public_html/store/app/functions/fn.common.php on line 1919
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REQUEST_METHOD in /home/XXX/public_html/store/app/functions/fn.common.php on line 6747
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REQUEST_METHOD in /home/XXX/public_html/store/app/functions/fn.control.php on line 286
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REQUEST_METHOD in /home/XXX/public_html/store/app/functions/fn.common.php on line 2309
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REQUEST_METHOD in /home/XXX/public_html/store/app/functions/fn.control.php on line 359
[03-Oct-2018 00:00:05 America/Chicago] PHP Notice: Undefined index: REMOTE_ADDR in /home/XXX/public_html/store/app/functions/fn.common.php on line 1919
[03-Oct-2018 00:05:09 America/Chicago] PHP Notice: Undefined index: in /home/XXX/public_html/store/app/functions/fn.database.php on line 493
[03-Oct-2018 00:15:30 America/Chicago] PHP Notice: Undefined index: in /home/XXX/public_html/store/app/functions/fn.database.php on line 493
[03-Oct-2018 00:15:35 America/Chicago] PHP Notice: Undefined index: in /home/XXX/public_html/store/app/functions/fn.database.php on line 493
[03-Oct-2018 00:19:22 America/Chicago] PHP Notice: Undefined index: in /home/XXX/public_html/store/app/functions/fn.database.php on line 493
[03-Oct-2018 03:22:21 America/Chicago] PHP Warning: strpos(): Offset not contained in string in /home/XXX/public_html/store/app/functions/fn.common.php on line 2137
[03-Oct-2018 04:18:26 America/Chicago] PHP Warning: strpos(): Offset not contained in string in /home/XXX/public_html/store/app/functions/fn.common.php on line 2137
[03-Oct-2018 04:24:30 America/Chicago] PHP Notice: Undefined index: in /home/XXX/public_html/store/app/functions/fn.database.php on line 493

I turned on error display and got an error msg related to an addon. So, for some reason after the crash/reinstall something went wrong. I think they updated my version of PHP an increment or two, perhaps that is what happened.