Anjaneai,
This could be the solution, but that phenomenon happens all the time in a 'not-consisten' way. I don't want to recreate all customisation daily,so avoid to refresh the Preferences. Clearing the cache is sometimes a solution, getting into the Edit Audio (even when not editing) sometimes pops up the missing buttons, restarting CP (or even the system) can also help. There must be something wrong in 6.1 with the Audio dialog.
Lieve