I did just do the update when i saw your post with your problems and was a bit scared that i should have the same problem.
You don't need to be 'scared' of anything. You should be making regular backups of your wallet.dat file so that even in the case of a full-scale disaster you are prepared. It has been working for me without any issues from the day of release.
but my avira free antivirus
Good time to change your AV. It seems fine with Bitdefender.
Sorry but RBF is a big no no. Opt in or not.
It is fine; it has its uses. Nobody is forcing you to use it.