Let's try this again..
The auto-replies on one of the public folders stops working and I do not know why. The folder is setup to respond with a "Thank you" when an email comes in. (Several rules are setup and processed in advance of this rule to try and prevent any circular bounces of emails: auto-replies being sent to another auto-reply responder which causes a continual flow of emails between the two servers.) If I right click on the public folder, select Properties, then select the Administration tab and then press the Folder Assistant button, I can then scroll through the list of rules setup for this folder. When the auto-reply rule stops working, there will be a red "X" in the Status check box instead of a black checkmark, like all the others have. If I then Edit the Rule and click OK, I get a standard warning that the rule will fire for all incoming messages, to which I click Yes to and then the red X is changed to a black check mark.
Here is a print screen of the actual error that is displayed:
How do I determine what is causing the rule to stop working??