I added a K2.net 2003 Task List to a team site in SharePoint. The only two properties I set for it are the two connection properties: server name and port (5252). It correctly displays tasks assigned to the currently logged in user when they first visit the page, but if a user presses the refresh button on the web part the task list is replaced with the following text:

Object reference not set to an instance of an object.

The only way for the user to see the task list entries again is to close the browser and start a new session.

Any idea what might be going on or how I can solve this problem?

Thanks!
DanJ