We are in the process of testing Office 2013, we have forms created in InfoPath 2007 that are linked on a SharePoint site to a shared folder (with read permissions for everyone). All our users still on Office 2007 have not reported any issues accessing or using our forms. The small footprint of users who are testing Office 2013 are getting the error "This form cannot be opened because it requires the domain permission level and it currently has restricted permissions..." I have double checked all our forms, and they are either set to automatic or full trust. We have tried the infopath /cache clearall trick, and it worked for about a day, then all the forms started getting the error again, and the cache clear isn't helping anymore.
Looking for guidance or suggestions, I was not included in the "pilot" of Office 2013 so my troubleshooting is pretty limited.