Could you please double check that you have correct entries regarding browser emulation for your machine (x32, x64 will have different paths) - Enabling HTML5 in the Windows .net Player
I guess it might depend on what those button should do, if it is publicly accessible, then you could share the link with us (via pm) so we can test it here locally.
Side note.
Just in case, it would be good to upgrade the player to 1.7.9 as well.