not reproduced with Inkscape 0.46-2 on OS X 10.5.8 (with cairo 1.5.14)
Save a copy as 'PDF via Cairo (*.pdf)' with the option 'convert text to path' checked creates a PDF file which renders the (converted) font [*] as expected and as displayed in Inkscape 0.46 and 0.47 on-canvas.
(ignore the old 0.46-bug where clipping paths are ignored in PDF output)
not reproduced with Inkscape 0.46-2 on OS X 10.5.8 (with cairo 1.5.14)
Save a copy as 'PDF via Cairo (*.pdf)' with the option 'convert text to path' checked creates a PDF file which renders the (converted) font [*] as expected and as displayed in Inkscape 0.46 and 0.47 on-canvas.
(ignore the old 0.46-bug where clipping paths are ignored in PDF output)
[*] 'League Gothic.otf' installed in '~/.fonts'