Am glad this is not just me, have been looking at this myself - thought it was something I did wrong.
On a frugal install on an old machine we updated, ran getflash11, it appears to create flash11 in the plugins directory yet the plugin doesn't load. have uninstalled all browsers and getflash11 and flash11. Have re-downloaded many browsers and of course getflash11 yet still plugin despite it being present does not load..
For me, this does not occur in all pc's, eg some updated VM's it works fine. I hate those intermittent faults.. :p