Initial build and test of the WaterColorBot went smoothly, up until I tried to print one of the example images built into RoboPaint. For example, the one called "still life". When I click Start it washes the brush and begins to paint with yellow. It successfully paints the highlight on the apple and most (all?) of the yellow dots on the orange. And then ... it just stops. The "Status" area in the "Auto-paint" box in RoboPaint says "Drawing path svg_24 fill..." when it stops, and it just keeps on saying that forever. There is never any error message. The USB LED on the EBB is blinking alternate short and long pulses. If I push the "Pause" button at this point, it appears to start the drawing over from the beginning, and again stops in the same place. This seems quite repeatable.
For another example, if I try the "mono lisa" example, it paints a couple of lines of orange, then moves the brush to a different location (where there isn't any orange I can see in the image) and then ... just stops. This time the Status is "Drawing path svg_61 fill...", but clicking the Pause button doesn't do anything. In fact, all of the in-window controls seem to be unresponsive.
I don't see anybody else reporting similar lock-ups on the forum or elsewhere on the net. What should I look for to debug this?
Bot S/N 0094. EBB board v2.3. RoboPaint says 0.7.0 on the main screen and Version 27.0.1430.0 (1430.0) on the About dialog. Running on a MacBook Air under Mac OS X 10.9.2, with the EBB plugged directly into the Air's USB port (no hub).