auth/login-form no longer functional link

[2TrakR]

At some point, due to an update or an unintentional action on my part, the login page link has stopped working on our forum.
When landing on our forum, we have a message with a link to the login...

[2TrakR]

Hit here too. I only see notes to install the patch. What other items need checked afterwards, excluding making sure forum is a clean copy with no extra files?

[2TrakR]

Thank you for the suggestions, I will check further. I have not received the error in ~ 24 hours after disabling thumbnails and changing attachments to be directory based. We were around 1GB for the attachment...

[2TrakR]

That error was being emailed to me from our server. I have not replicated the error, but have been seeing it over the last two weeks. Appears to be when users browse a particular board/thread, but again,...

[2TrakR]

PHP 5.6.37
VB 5.4.2
SQL 10.2.16-MariaDB
No Add-ons

[2TrakR]

Randomly getting the following SQL error. Different users. I'm having difficulty determining "what" is wrong. I believe it is indicating a thumbnail image is the cause, but if so, I can't determine...