XF 2.2 Strange issue with my account only on my forum

[webbouk]

For some reason when I log into my forum and make a new thread or reply to a post, the new thread or reply is added to the database and is posted to the forum, however the contents of the post remains in the reply box and does not display unless I refresh the page. The content seems to stick in the reply box.
I thought at first I might have cached a corrupt file or cookie so I cleared them from my browser, however the issue remains and affects all browsers I have tried and on other devices, which leads me to believe the issue is with the member account rather than a browser issue.

Using F12 and Console during a post/reply I see the following....

POST https://www.mysite.com/forums/threads/anythreadtitle.260798/add-reply 500 (Internal Server Error) jquery-3.5.1.min.js?_v=e298ffe6:2

I made a few changes within the server the same day that this issue arose but those were reverted. The problem does not appear to affect any other user.
When posting a Conversation or replying to an existing one, the issue doesn't arise.
(I can post perfectly well on here)

Has anyone any suggestions?

 

[Paul B]

Check the server error log for the cause of the 500 error.

 

[webbouk]

Am I checking the right log file ( /var/log/apache2/error_log ) as I cannot find an entry with my IP address as client?

 

[MentaL]

cat error_log | grep "IP"

Should output any hits.

 

[webbouk]

The IP address doesn't exist in the error log.

If I check the raw logs the IP address does show when I'm posting to a page, POST however it doesn't show any errors

 

[webbouk]

Attached is a screenshot of the headers from F12> Console when creating a new thread

 

[webbouk]

The issue......

Logged in as 'Dave' (User ID 3)
Go to reply to a post or make a new thread
Type in post reply box
Hit 'Post reply' button
Green bar moves across the top of the screen to signify something is happening
Nothing appears to happen. Text still remains in post reply box
Refresh page manually
Text appears as a reply or new thread depending on original choice as you would expect
Text also remains in post reply box

This doesn't affect any other user that I am aware of
If I log out and log back in as another user everything works as expected
If I log in as 'Dave' on any other device or browser the issue exists which rules out cookies or temporary internet files

The best way to describe it is that when making a new thread or replying to an existing thread once the Post Reply button is used the form acts as intended but the page does not automatically refresh.
This only affects the user ID 3 (ie 'Dave')

However if I type a reply to a conversation everything works as expected.
It is as though the action POST is not working correctly for this one user ID

 

[webbouk]

All sorted - many thanks to @AndyB for his help

 

[Old Nick]

Thread very useful to the community or no one, apart from you, will have learned how to solve this type of problem.

 

[webbouk]

The problem arose through an issue with an add-on following an export of the database via phpMyAdmin.

Disabling all add-ons resolved the issue. Then it was a case of enabling them a few at a time until the problem occurred.
Once we knew which it was then possible to work out from that where the error was and how to eliminate it.