Sorry for the slow response on this. Been busy.
Nothing extra appears in the terminal when pushing the add button, just a start up notice about waiting for a connection on port 52799, then a 'Connected to a device channel' followed by a long string of alphanumeric characters, followed by a 'Connected to user channel' and another long string of alphanumeric characters. That's it until MatterControl is exitied and a prompt is returned back in the console.

Hi, Just installed MatterControl onto a Linux machine I have for printing. Have been using RepetierHost & Slic3r previously.

Installed all ok, up and running, printed calibration cube, which was showing after install, as a test, all good.

Went to add another object into the queue with any of the Add buttons for menu drop down and no dialog appears to allow the selection of a file.
Run as user or as root, same issue (thought it might have been a perms issue top open the dialog).

Version installed is 1.7.0 on Ubuntu 16.04.1 LTS.

Any help would be gratefully received.

TIA.

A.