have a really odd problem since upgrading from 2.5

originally had a trial version of 2.5 installed and it worked perfectly. The trial expired, and i purchased a license.
upon doing this, the software came with update to 2.6.1

once i updated, none of my devices can browse the folder located on the external drive. (connected via usb)
the drive is present, and mezzmo can see the drive and all files. I even cleared the library and re added everything to make sure.

the server can be seen on the the devices and while browsing, as soon as you select the folder located on the external drive, there is a brief pause, then an error message. moving the folder to the C drive solved the problem, but my server has a very tiny drive so i can't hold much on it (30gb ssd) devices in question are samsung tv un55d6000 and asus o!play.

and to make things even more complicated, uninstalling and reinstalling 2.5 everything worked again, until i put in my license key. once i put in the key and restarted the server (still on 2.5) ran into the same problem.

anyone have any ideas ?