Apple has released iTunes 12.5.5 in conjunction with the release of macOS 10.12.3 (see “Apple Releases macOS Sierra 10.12.3, iOS 10.2.1, tvOS 10.1.1, and watchOS 3.1.1,” 23 January 2017). Unfortunately, Apple provides only the inscrutable “minor app and performance improvements” for its release notes. If you come across any notable changes in terms of performance or user interface, please leave a comment below. (Free, 263 MB via direct download or Software Update, release notes, 10.9.5+)
I have had to keep it closed because of spinning beachballs.?
Since the update of itunes 12.5.5 my album artwork now flickers for a split second upon opening to view album tracks, then again upon selecting any song within the album. Very annoying!!!! Contacted Apple about it (January 30, 2017) and they are waiting to see how many reports they get before issuing a patch. Using a 21" 4k iMac (late 2015).
Paul -- if you can please reference the bug ID or support thread, I'm happy to add to it