I ordered and received a Smoothieboard last week and right off the bat I am having some strange connection problems between PC and the Smoothieboard.
I am only able to communicate with the Smoothieboard using Pronterface or Repetier-Host right after I install the Windows (7, x64) drivers. As soon as I either reset the board or disconnect/reconnect the USB cable, I am unable to connect to the Smoothieboard again. Pronterface will get stuck on "connecting…" and Repetier-Host seems to think it is connected but states "x Command Waiting" with x being a number depending on the amount of commands waiting in queue.
The only way around this is to uninstall the Smoothie drivers in Windows and reinstall them, after which I am able to connect and send commands again until I either reset the board or unplug/replug the cable.
SD-card is always accessible through Windows explorer. I have tried several PCs (both Win7 x64) and changed out USB cables, tried both Edge and Master firmwares with default config but no difference.