Hi,
I have been struggling for hours trying to work this one out and having read pages and pages of this site and others, I learned the following.
Hopefully, this will help any others trying to get joomla / virtuamart and SME to work.
When I installed joomla/virtuamart I was 'warned' /tmp was not writeable. So I used CHMOD 777 /tmp. This did not work.
Eventually, the following did work.
[root@e-smith ]# /sbin/e-smith/db accounts setprop youribayname PHPBaseDir /home/e-smith/files/ibays/youribayname/:/tmp/
[root@e-smith ]# /sbin/e-smith/signal-event ibay-modify youribayname
This will allow PHP to write to your /tmp directory.
I hope this helps,
seabro