Upfront editor hanging at 73%

Upfront editor was working just fine then it started hanging at 73%. I've cleared my cache, restarted computer, read the support forums, reviewed an old ticket when I had asked for support on the same issue some time back, and tried to modify the upfront build file with some code from last time. All to no avail.
I've enabled support access. Would love some help!
Thanks and I hope you're having a great day.