InfoPath Dev

Hi, I am having a strange problem with attachments field on a list InfoPath form. The attachments get uploaded successfully but not able to access/open any attachment uploaded by someone else, on the form. The error says "The file is corrupt or invalid". It is happening for all the file formats...

I have an InfoPath generated from a state machine workflow, the InfoPath is linked to a SharePoint list. The problem is: When I fill the fields of the InfoPath and click the Submit button (which submits the form and closes it), when I re-open the form I find all the data that I have just filled...