I just installed Create on my computer. I use Windows XP Pro SP3 and Firefox 44.0.2.
Create will not recognize my Arduino Uno R3 and USB port. It just give a red cross in front of the Uno selection.
I have uninstalled.
Hope someone has a solution. In the meantime I go back to using 1.6.7.
Greetings, Henk Siewert