I have a font called SPIonic, which I use for writing Classical Greek. It is
designed so that the vowels of Classical Greek can have all the varieties of
diacritical signs above (and sometimes below) them, sometimes with more than one
sign per vowel. The text appears correctly aligned on screen, just as it appears
printed.  So, for example, to type the vowel ‘iota’, which looks like the Roman
i, with an acute accent and the ‘smooth breathing’ sign, you would type i, then,
without holding down, the numeral 1. This font works OK on my computer (IBM
ThinkPad) in Corel WordPerfect and Microsoft Word, but not with Open Office, and
I am wondering what the problem is.  In Open office, the diacritical signs
either appear, and print, after the vowel, or do not appear at all and are
represented by the ‘empty’ rectangle symbol. Have you any thoughts?