brasero 2.28.3 reports permission error after burning

[peng shao <shallpion gmail com>]

Hi I am using gentoo/gnome-2.28.3 and recently I've noticed if I use 
brasero to burn a cd-r, then after it completes the burning successfully and is creating checksum image, there is a pop-up window telling me

You do not have the required permissions to use this drive

and if I looked into the log file, it says


BraseroChecksumImage called brasero_job_get_fd_out
    readom
    dev=/dev/sr0
    -nocorr
    -noerror
    -sectors=218879-222165
    -f=-
BraseroReadom Launching command
BraseroReadom stderr: Error trying to open /dev/sr0 exclusively (Device or resource busy)... retrying in 1 second.
BraseroReadom stderr: Error trying to open /dev/sr0 exclusively (Device or resource busy)... retrying in 1 second.
BraseroReadom stderr: Error trying to open /dev/sr0 exclusively (Device or resource busy)... retrying in 1 second.
BraseroReadom stderr: Error trying to open /dev/sr0 exclusively (Device or resource busy)... retrying in 1 second.
BraseroReadom stderr: Error trying to open /dev/sr0 exclusively (Device or resource busy)... giving up.
BraseroReadom stderr: WARNING: /dev/sr0 seems to be mounted!
BraseroReadom stderr: readom: Device or resource busy. Cannot open '/dev/sr0'. Cannot open SCSI driver.
BraseroReadom called brasero_job_error
BraseroReadom finished with an error
BraseroReadom asked to stop because of an error
    error        = 4
    message    = "You do not have the required permissions to use this drive"
BraseroReadom stopping
BraseroReadom got killed
BraseroReadom stderr: readom: For possible targets try 'wodim -scanbus'. Make sure you are root.
BraseroReadom stderr: readom: For possible transport specifiers try 'wodim dev=help'.
BraseroReadom disconnecting BraseroReadom from BraseroChecksumImage
BraseroChecksumImage stopping
BraseroChecksumImage closing connection for BraseroChecksumImage
Session error : You do not have the required permissions to use this drive (brasero_burn_record brasero-burn.c:2808)

I am already in cdrw group. Anyway this error message seems to be harmless because the disc is actually burned successfully. But it is still annoying and may have some potential problem. Anybody met this before? Thank you.

Peng