problem with accented letters after upgrade to 3.8.6

[ik7jwy]

HI all,
I upgradted today the board from 3.8.5 to 3.8.6. Now I have a problem with the
accented letters and some others characters (°. @ # etc).
When I use the quick reply to write a message and I write, for example, the
accented letter "è", when I go to read the message in the forum I see the code
"&#232" instead of "è". If I use the "Quote" or "Reply to" buttons to send a
message, this problem not happens.
This is the first time that I have this problem after upgrade from an older version to the newer. Never happened before.
How can I fix the problem, please ?
Thanks

Arturo