If anyone experience the crash on start bug, you can try deleting the favicons cache file from Opera Neon file cache.
Open Explorer, navigate to: *%appdata%..\Local\Opera Software\Opera Neon\User Data\Default*
Then, delete the "favicons" file and try to open Opera again.
For easy bug fix, create a .bat file and put this command (because the crash will start again in a random day):
del "%appdata%..\Local\Opera Software\Opera Neon\User Data\Default\favicons"