A family of Microsoft relational database management systems designed for ease of use.
Keeping in mind what you said about starting a new thread, although this thread explains is so well, I'm having exactly the same problem. Have trusted location for front end and back end. I have this problem on the Windows 7 computers running Access 2013. I do NOT have any issues with two computers running Windows 8.1 and Access 2013.
Suggestions (besides upgrading to Windows 8.1?)