I've upgraded from 10.04 to 12.04 and Evolution migrated my mail box ok, then in the last week I started noticing that all the s's in my mails were purple, even in the subject line.

I dont think I've done anything and it is a strange behaviour.

I cant find anything when I search for other instances of this.

Does any one have any ideas whats gone on?

I'm worried that this might be a virus and that would be a 1st for me on a Linux platform.