Hi,
I'm just wondering whether OnTime 2008 is planned to support SQL Server 2005?
OnTime installs fine with SQL Server Express 2005 and I have had no issues besides when I attempted to interface a test management tool. The tool interfaces through the browser commands.
Maybe there is a potential locking problem within the database when SQL Server Express 2005 is in use.

http://www.passmark.com/forum/showthread.php?t=1349

SQL 2005 is supported.  The errors you are seeing are not related to SQL. 

The locking error comes from the new locking mechanism we implemented, and it probably occurs because you were editing an item and closed the browser instead of canceling the edit, which will keep the item locked.  When trying to edit that item again you would not be able to do so until the lock expires or you delete the lock (from Help -> Lock Manager).

The null reference exception occurs when the session expires.  This issue will be fixed in the next release.

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Dan Suceava
http://www.axosoft.com