Hi ​@tyddynonn 

Thanks for your post!

We (as far as I am aware) are not familiar with this issue with tracks showing as blank in the queue. I rather suspect that it has something to do with the particular file stored on your Music Library server, and most likely, it’s metadata (or lack thereof).

If you cannot see anything wrong with the track yourself, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to remotely access your computer and try to find out for you.

I hope this helps.

Thanks Corry 

This issue was reported by at least one other user (see the referenced link) 

interestingly, the underlying playlist is fine, the blank entries only appear when I copy it into the queue (via the Shuffle option. 
Music is stored on a Synology NAS

I’ll raise it with support as you suggest

Hi ​@tyddynonn 

By “not familiar with this issue”, what I meant was that we have not investigated and verified that there is an issue, not that no-one had reported it.

By it’s very nature (relating to files that the specific user has and no-one else), this reported issue is very likely to be to do with the local file. If it is found not to be, however, then your having been in touch and the agent's documented attempts to investigate or resolve the problem will mean we’re already on the way to doing something about it.

I’ll admit that this makes it sound more like an issue that we will need to address, but let’s see what the team make of it.

I hope they are able to assist.

An update: It turns out that the the problem was that my playlist contained an entry for which there was no underlying file in the Music Library (stored on a Synology NAS). 

I don’t know how that happened, but the difference in behavior between the iOS and Windows Apps helped me track it down.

In the iOS app, this situation gives a blank entry in the queue, and playback stops when the entry is reached.

In the Windows app, the entry shows the (missing) filename.

A useful discussion with Sonos support, who agreed that the UI could be more helpful - perhaps by marking the queue entry as ‘faulty’. They also confirmed that there is no tool available to validate a playlist, so I had to find the offending entry by inspection.