Mick Hardy
When you browse to load source media from a USB connected GoPro Hero 4, you will be presented with a message box that says, "Cannot open multiple items from this location. Try selecting a single item instead".

This is due to a change in the way the GoPro Hero 4 connects to the computer. It now uses MTP (Media Transfer Protocol). Previous GoPro models connected using UMS (USB Mass Storage) and created a mapped drive letter in Windows Explorer. The same problem also occurs on Macs and Linux machines. The error message is given by Windows, not by TandemVids. There is nothing I can do to rectify the problem.

A workaround for the moment is to use a card reader. I have heard mention of a hack to force the Hero 4 to connect using UMS. If I find a solution, I'll post it here.

Apologies for the inconvenience. Mick.