This bug is reproducible on my system - fedora core 2, fop 0.25.5, using inline blocks. I am using superscripting in inline blocks (<fo:inline vertical-align="super" font-size="8pt">12</fo:inline>. Throughout my entire document, it works just fine except for one instance. When the word with the superscript characters appears in shows up first on a new line, but not the first word in the paragraph, all tags except font-size are ignored when rendered. The 12 would not superscript until i put a test word in front of it.
Fixed in FOP 0.94 and probably earlier versions
batch transition pre-FOP1.0 resolved+fixed bugs to closed+fixed