For anyone in the future, if this occurs to you: the solution is to delete every single opera file in appdata & registry after uninstalling opera, then reset your computer and install a fresh one. Worked for me, discussion to be colsed.
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RE: [Solved]Opera resets part of settings on startupOpera for Windows
[Solved]Opera resets part of settings on startupOpera for Windows
Every time i turn off and on the browser it logs out my opera account (all the sites like fb are still logged in), hides bookmarks bar, changes background image to default and un-installs all of my extensions. It started happening two days ago and is driving me mad. Tried un-installing opera from pc and clearing registry with no effect whatsoever. IF someone could help me with it i would be very thankful.
Windows 8.1 Pro 64bit