As reported by Anudu in
this thread and by several members in the german community there are problems with MyCode after the update to MyBB 1.2.3.
The MyCode does not get parsed in posts that existed before the upgrade. Everything is fine with new posts/threads.
Works fine on this forum
OK, it's solved.
The problem was, that there was a mismatch between the encoding sent in the HTTP header (iso-8859-1) and the header of the board (utf-8).
After converting the database to utf-8 and installing a plugin that sends the right header everything works fine now.
I attached the plugin if someone else has the same problems.
BTW, everything worked fine in 1.2.2.
Did you change your format to utf-8 in the language file? Is this a bug with MyBB?
No, I did not change the language file. I'm not sure if it's a bug in the board but it worked in 1.2.2 so something must have changed.
We've already figured out the cause of this bug, and are taking some preventive measures to fix it. Marking as fixed.
This bug has been fixed in the latest code.
Please note the latest code is not live on the site or for download. An update will be released which contains this fix.