I was having the same problem as Chris with the IDE saying
“This request is taking longer than usual, please be patient”
and reflashing Tinker with the iOS app gave me
An error was reported by the Spark Cloud. Please try again later. If the issue is not resolved, please visit www.spark.io/support for help.
Holding the mode button down didn’t do anything. I messed around with it for hours and now it’s working. I’m unsure what exactly I did to fix it, but I did hold in the mode button for 10 seconds while powering up and this restarted everything and I entered my wi-fi details with the app and it started working correctly. BUT, I tried this 10 sec on power up thing probably a half dozen times before I got to where I am now.
I have a feeling there was something corrupted that eventually got rewritten with the correct value and now it works. I’ll gladly provide more details if they can stop this issue from appearing for other users.