HTML Editor preview changes to Plain Text with HTML code

I've scoured the forums to find a solution, but no luck.

Issue is when I use HTMLarea (or FCKeditor) to change product description or compile Gift Certificate email, it outputs the HTML text to Plain Text with all the associated HTML code included.

Example:

H:450mm￠:50mm

Outputs as:

H:450mm￠:50mm

This happens with any text, whether I type it, or copy/paste.

I'm using Zen-Cart v1.39h with a few mods, so I'm thinking that there may be a corrupt file somewhere. If anyone could point me in the right direction, would be most appreciated.

H:450mm & #65504;:50mm

Is this a new 1.3.9h installation, or an upgrade from an earlier version ?

Upgrade from 1.39g

Since that's a known bug in 1.3.9g, I'd guess you didn't upload all the 1.3.9h files. You might go through the list again.

Thanks!

Would you recommend I try the 1.39h upgrade again, or do a fresh install with the newer version?

and.. if I upgrade will it affect my shop / default settings / mods etc?