Hi,
Some notes about my experience with this.
I am rebuilding a site that developed a (non-encoding-related) problem I could not solve so I started again and since I have an english-spanish site it seemed a good idea to go UTF-8 from this new start.

I followed the tutorial and all seemed to work ok.
Now I am gradually adding in the template mods I did previously.
(I’m using Notepad++ which shows the encoding of the file and can convert between different encodings and UTF-8, it reports the file encoding on the bottom right of the status bar.)

1) Adding spanish language files (from an old contribution which I have updated to 1.38a).
Firstly I found that any accented character was wrongly reproduced in the shop.
Notepad++ reported the relevant language file as being ANSI encoded.
I converted this to UTF-8, the accented characters in the file changed to unrecognised characters which once corrected displayed correctly in the shop.

2) Next I started getting blank screens on certain places in the shop.
I found that this was due to now having the spanish.php (or english.php) encoded as “UTF-8” instead of “UTF-8 without BOM”.
Things seem ok now.

So, I don’t know whether I now have to convert every file in the shop whether pure php or only the language files to have things as they ”should be”?

Regards
Steve