since Lion the Library folder is hidden from view by default.
To make it visible, open a Terminal window and type
chflags nohidden /Users/<USERNAME>/Library
Of course <USERNAME> is to be replaced with the short name of the user account you have the problem with. This command does not require administrator privileges.
If you want to restore the default setting manually, the command would be
chflags hidden /Users/<USERNAME>/Library
If I am not mistaken, OSX does execute that command automatically at next startup anyway.
Hope this helps,
Found the "easy" approach..
A) Hold Option while selecting the Go Menu while in the Finder. The User Library shows as "Library".
B) Keep holding Option as you select Library. (If using Sticky Keys, this means lock the Option Key at point A.)
TADA! The user library is opened before one's eyes.
From there, I switched user accounts via fast user switching, repeated the above. Next I copied the DVD Player folder in Application Support to an external drive, switched back, and replaced the corrupted user folder by copying the one on the external drive.
Sound has returned to the DVD Player! It was likely one file, but none popped out at me, so I just replaced the entire file.