There is a notice posted for slow account creation.
http://forums.autodesk.com/t5/general-fusion-360-questions/notice-slow-account-creation-due-to-high-...
Could this issue be related?
Are there any messages when logging into your dashboard via a web browser? (https://myhub.autodesk360.com)
After deleting the Web Service folder, you should be prompted to re-log into Fusion 360 with your Autodesk ID. The directory should be re-created.
If you are crashing on start-up, are you submitting the customer error reports to Autodesk? If so, could you please enter your e-mail address in the submission form?

Otherwise, you may provide the reference number for the customer error report (CER). Having a report to look at may reveal useful information about this issue. Please keep me updated on your progress.
Thanks,
Nathan Chandler
Principal Specialist