I’ve tried on several occasions to upgrade to the Professional plan but the final step of the “Upgrade Plan” popup fails to progress to a confirmation of payment (it just hangs on the processing graphic) and there are javascript errors on the page. I’ve tested in Firefox, Chrome and Safari. Have been waiting on support from Cloudflare for over 72 hours 
Something must have broken with a recent code rollout
Just surprised Cloudflare does not act quicker on people who want to give them money 
Unbelievably bad service and seems to be a biproduct of a company that’s grown so popular that they now take customers for granted.
Can you post a screenshot of the error?