The B and H characters on on my ubuntu desktop become a dark block, on the software menu, contain and the panel at the top too.

The attached image is from Thunderbird.

Any suggestions?

Thanks.

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Very occasionally one particular program will quarrel with one particular font. I've just been looking into a similar problem experienced by another user. One font worked fine in applications, but in the desktop (e.g. Nautilus) the Latin 1 characters turned into Cyrillic! We checked his settings and the font, but there was no explanation. I once had a problem where OpenOffice couldn't handle "à" in one particular font.

So, does this still happen if you use a different font? If it doesn't, then there's just something funny about that font. The chances of finding out what, even with a font editor, are low, so pick another one.