There was a problem with our server this evening, I'm not sure what yet. When it came back I had to repair the tables and posts before the forums would work again. I was then able to post as admin.

I then became a user to see if they could post and I was presented with this message:

Database error only visible to forum administrators

I could then not log back in as admin and am now shown this:

Fatal error: Call to a member function error() on a non-object in /home/vhost/domain.com/html/libs/mysql.inc.php on line 210

Any ideas as to what I can do to fix this please

Well, the SQL error is only available to admin's; so you'll need to get the content of the error to see what the problem is; you can do this by either enabling sql logging in the control panel or theres a "tick" in the /libs/mysql.inc.php file to show errors to all users (just search for error i think)

Thankyou Gizmo. I cannot get into the control panel now

I edited the file and now I get this message:

Fatal error: Class 'sql' not found in /home/vhost/domain.com/html/libs/ubbthreads.inc.php on line 115

Parse error: syntax error, unexpected $end in /home/vhost/domain.com/html/libs/mysql.inc.php on line 40

From admin screen:

Fatal error: Call to a member function error() on a non-object in /home/vhost/domain.com/html/libs/mysql.inc.php on line 210

From users screen:

Script: /home/vhost/domain.com/html/libs/ubbthreads.inc.php
Line#: 2026
SQL Error: Table 'ubbt_CACHED_PERMISSIONS' is marked as crashed and should be repaired
SQL Error #: 1194
Query: delete from ubbt_CACHED_PERMISSIONS where CACHED_TIMESTAMP < '1183295190'

What exactly did you do to mysql.inc.php?

By changing:
$showerror = 0;

to:
$showerror = 1;

it should not throw ANY errors other than the anticipated mysql errors...

just changed 0 to 1

It then shows users:

Script: /home/vhost/domain.com/html/libs/ubbthreads.inc.php
Line#: 2026
SQL Error: Table 'ubbt_CACHED_PERMISSIONS' is marked as crashed and should be repaired
SQL Error #: 1194
Query: delete from ubbt_CACHED_PERMISSIONS where CACHED_TIMESTAMP < '1183295190'

Run this query from your admin center in database tools, if you can't access your CP, use PHPMyAdmin (or some other similar MySQL database tool) and run the following command:

Done. Received

threads.ubbt_CACHED_PERMISSIONS repair status OK

but still no joy