WordPress strange behaviour – RSS not valid, sub-menus don’t work

While dealing with a problematic RSS feed that was for some reason not validating even though there was no apparent reason (It kept giving me a

After researching the matter and trying so many suggested solutions that didn’t work,
I tried searching for BOM signatures on files I manually edited.
After using Notepad++ to open a plug in file that I played with and converting it
to UTF-8 without BOM I noticed the file’s size was reduced by 3 bytes and everything started
working again.
The big bonus was that now also other problems I had with sub-menus and such were solved.

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