I am pleased to report that I have had great success with getting the Album artwork updated on most of my Apple devices. The ONLY device that has NOT yet updated is Apple TV.
I'm running iTunes 11.0.4 on Mac 10.7.5 (Lion), where I made the original updates.
Latest versions for both. I just updated iTunes today.
- iPhone 5: iOS 6.1.4 (latest)
- iPad Mini: iOS 6.0.4
- Apple TV: 5.2.1 (latest)
The process I used:
- Update Album info (Artwork on all, Name and Date on some) on 10 albums by using "Get Info" on the Album in iTunes.
To update the artwork I simply did a drag-n-drop from a web site
- Switch to iTunes Store in iTunes
- From the iTunes menu, Store > Update iTunes Match
- Wait 5-10 minutes to give Apple plenty of time to get my changes into the iCloud
RESULTS
- The changes I made to Album Name and Date were updated on ALL devices
- The Album Artwork on ALL albums was updated on my iPad Mini
- The Album Artwork was NOT updated for 4 Albums on my iPhone 5
- None of the Artwork was updated on Apple TV
I even did a "Reset" of Apple TV just to be thorough.
I don't know if the process is slower with Apple TV, or if it just needs a software update.
I'm assuming that the artwork was of "acceptable" size on all albums since all were updated on the iPad Mini.
I'll report tomorrow whether or not there have been any further changes.