I'm seeing occasional hangs when I "paste" a playlist I just cut. For instance, I have a structure which looks like (in terms of playlists)

shadow
/AliceCooper
/GreatestHits
/Alice Cooper
/HeyStoopid
/PrinceOfDarkness
/AllmanBrothers
/BadCompany

etc. If I cut "Alice Cooper" and paste it into "AliceCooper" then cut "HeyStoopid" when I try to paste it into "AliceCooper" the dialog box I right-clicked to bring up and choose paste from never goes away.

Likewise, if I leave "Alice Cooper" where it is and cut "HeyStoopid", then paste it into "AliceCooper" that works, but when I cut "PrinceOfDarkness", when I go to paste it, the paste hangs.

The same pattern seems to hold in the rest of the playlists.