I managed upgrading my forum from 18.104.22.168 to 3.0.0 with the 6000 messages in the old version.
In 22.214.171.124 I had mimetex working fine. And almost all my messages have some sort of equation using mimetex (with the BBCode [tex]).
In my new server I've successfully installed mimetex, it is working properly (the example file can show all the equations and produce the correct cache for those equations written in the example.php).
I've changed the things you instructed in this post
(btw, for mimetex there are 8 changes for $text, not just 6).
Now I can use mimetex for my new posts, but without cache for equations in the forum. This is not my biggest problem.
My problem is with the legacy message. No one is showing the equations. The BBcode is not being converted for the old messages. But, if I edit any old message, after saving the equations are ok for this message.
Is there some way to reprocess all messages?
I am using phpBB3 3.0.0 Olympus on a Linux shared server.
Thanks in advance.