Hello,

I installed Arduino IDE 1.8.6 (Windows 7) a couple of days ago, to resolve "Rebuilding All" every time. Good work and thanks! Just donated 50ドル :-)

Unfortunately, it seems communication with the DUE board is now broken (at least intermittent). When trying to upload a sketch to DUE, the error "No device found on com" intermittently displays. Fidgeting with the DUE board and IDE sometimes renders a successful upload. However, I haven't been able to find a sure-fire way to upload successfully every time. Success rate is about 25%. Problem occurs with both DUE USB ports: Native and Programming.

I'm currently running Arduino IDE on three machines:

Windows 7 with IDE 1.8.6: "No device found on com"
Linux Mint 18 with IDE 1.8.6: "No device found on tty"
Manjaro Arch Linux with IDE 1.8.5: Uploads successfully 100%.

The Windows 7 machine previously had 1.8.5, which had 100% upload success rate. Both Linux machines have fresh installs of Arduino IDE. The same DUE board was tested on all three machines.

Thanks and Best Regards