still out of luck if it's a 64bit distribution
I can't tell if it's an Adobe problem or a Mandriva problem and I've not yet tried under 2009.1 yet but 2008.1 is having nothing to do with the 32bit Flash player plugin with 64bit Firefox.
I remain too stuburn to install a 32bit browser on my 64bit platform however 32bit flash did install clean with 32bit Mandriva 2007.1. It was that easy too, download, uncompress, run install.sh.