This problem just started happening last night (7/12/2016). I exported my C2 project using the "new Intel XDK project format" option. When I import it to Intel XDK v3400 (with the xdk project format), Intel XDK gives me a build error stating it cannot contact remote build servers. Please see link: http://i.imgur.com/3cbTBml.png.
I was waiting for Intel to fix the problem. But I went on go ahead and exported a project this morning that does not have the "new Intel XDK project format" option. Everything works and I have no errors and/or problems.
Is anyone else experiencing the same problem as I do? Do I "lose" anything exporting a project without the Intel XDK project format? Thanks in advance for your reply.