InfoPath Dev

I created a form in Infopath 2007 and placed it on SharePoint 2010. It was tested and worked nicely. I don't know if the SharePoint site went through some change, but after someone from another dept (ADW1) used the form, everyone started getting the following message (everyone including me and I am listed as an Administrator of the ...

 I am very new to InfoPath and am not certain how to describe this so I will provide an example.  I am trying to use a Text Box called "Request Number" to have the program automatically assign the Request Number so that it will appear in the box as "Request 1" and then have the document save as "Request ...