Opera Next cause Boot fail in Mavericks

I have been using OSX Mavericks and most go fine. I noticed that Opera Next can cause Mavericks to fail on boot. Here is what happened:

When I started Opera Next and accidentally, I click Opera Next icon twice, One click on iits icon in Applications folderafter Opera Next window has opened and show on the desktop. This will cause Opera Next window to close momentarily, then open again. After that I close Opera Next and shut down my MacBook Pro with retina display mid 2012 15 inches running OSX 10.9

When rebooted, my Mac chime as normal and gray Apple logo appear on the screen, hour glass swirl a while then it just hang at this gray screen.

I have tried to reset PRAm, NVRAM and reboot to no avail. To correct it, I must restore from my Time 'Machine backup and my Mac will reboot normally.

This happen to me twice accidentally, one time early November and one more time on December 10. I have removed Opera and Opera Next off my Mac using CleanApp and see that there are lost of Giles created and used by both Opera and Opera Next.

Browser should in no way cause an OS to corrupt and refuse to boot normally. Any expert here experienced this problem? Is it Oprra problem that corrupt OSX Mavericks or it is the instability of Mavericks itself?

Advise and help please