Still no joy. I tried deleting Repetier and its preference file and re-installing the firmware on the Bukobot.
Here's the behavior of everything I've tried...
In Repetier I can go to printer settings and select printer (usbserial-DA005MG8), go through the various tabs for connection, behavior, dimension, advanced. Checked that all the parameters make sense. Apply and OK.
The text on the bottom of the window says "132 FPS Unknown printer firm... Disconnected"
I can rotate and zoom the print volume graphic (though the rotate only takes effect after doing some sort of zoom).
Clicking on Temperature Curve replaces the 3D view with a blank gray rectangle.
Clicking on Load G-Code opens a search window, so that seems okay.
Clicking on Preferences opens up a preferences window showing 3D parameters , visualization quality and such, which responds when I click on things, however selecting configuration panels (host, slicer, 3D visualizations, color) is unresponsive.
In the main window clicking on Object Placement, Slicer, G-Code or Print Panel are unresponsive.
This seems to be about all I can do, and if I select the icon in the dock, I could quit the program, however as soon as I click on Connect, the program freezes and the dock says Force Quit.
After forced quitting and restarting there's a blue rectangle overlaying the Save as STL and Slice with Slic3r buttons saying Disconnected and the 3D view is an empty gray rectangle. Load G-Code still responds, and this time I tried loading some G-Code (from my old Maker-bot) and it looks like it did load something, the 3D view came back, but was unresponsive beyond that.
And it still has the Unknown printer firm... Disconnected at the bottom.
That's about all the symptom dump I can think of. Thanks for any suggestions!