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That's odd: if you're hitting up against the maximum size, you would get an error (and 2.78KB isn't that big in terms of size). And if you only hit Preview, it doesn't submit.
Have you modified post.php?

Moved to Modifications

Moved to Modifications

I'm closing this: you already have enough topics on this subject

Keep the forums up to date and you should be fine
Also, more generally, don't use easy to guess usernames/passwords

Moved to PunBB Discussion

Paste a copy of your index.php here please?

Paste a copy of your format_time function

As Bekko and Jérémie have said, the issue isn't with concurrent users: the issue is with integrating PunBB logins and Trac logins in a sane way

Bekko: Both of your examples wouldn't actually inject anything (only mysqli_multi_query allows multiple SQL statements). You would have to use a UNION instead.
However, what you said is right: intval numbers, $db->escape strings (where people could put 's or "s in) and you're good

The timezone set in the admin panel should be whatever your server clock's GMT offset is. That way, the base time is GMT. Then in your profile, you can adjust to the proper timezone

In 1.3, GMT will be properly calculated without any input from the user: the current option will be replaced with the ability to set the default timezone for new users/guests.

Extensions, extensions, extensions

Amazingly enough, PunBB-Hosting is on shared hosting