I checked out several FOSS project management software recently and i was quite impressed with "project-open".
http://www.project-open.com/
http://sourceforge.net/projects/project-open/

other ones i considered are
1. Planner: AFAIK no web based interface which i needed
2. dotProject and phprojekt which are really good ones
3. egroupware an excellent group ware application that can support some features of PM
4. Bugzilla - Excellent bug tracking tool. its perl based and since i usually customize most FOSS software i install , the fact that bugzilla was perl based did not attract me.

Recently i experienced this issue and thought of blogging it.
we were using adodb for database abstraction and had enabled logging.
The error that was given by adodb was like
"LOGSQL Insert Failed : insert into adodb_logsql ..." i have not put the entire SQL there and "Incorrect key file for table yyy.MYI; try to repair it". yyy is a fictional table name.

In this case the server was running linux and the file system had a 2GB limit for a file.

if you get an error like below
UID of script "/var/www/index.php" is smaller than min_uid

then chown "/var/www/index.php" to a user, who lies below the current user who owns the file and check.