I have a suspicion that it comes down to the total of all file sizes rather than the actual number of tracks. My "Your Music" only reached about 9,150 songs before it refused to Save any more. This included all the available Fela Kuti discography (most of which I have on CD or iTunes anyway). Many of the tracks on those albums are 15 – 20 minutes long, the equivalent of each side of a vinyl album. I think 10,000 tracks is used as an average; in much the same way as an iPod might nominally hold 10,000 tracks, but if many of those are longer than average it actually holds a lot less.
I have removed most of the music which I already owned, and I believe this has freed up space to enable me to save to "Your Music" again. Until Spotify sees fit to increase the limit (or trash it altogether) I think I'm going to have to manage my "Your Music" collection quite carefully.
It's unlikely to be the track length, the Your Music system essentially just holds URIs that point to content, not the content itself in the same way if you copy and paste stuff from playlists into plain text you just end up with the identifiers:
Ok, it seems that the issue is definitively related to the number of saved songs in some way (about 9300 in my case)...I have removed some of them and the save functionality works again (but now I have another issue on the PC client: the albums and artists sections return an error and don't load anything...).
I agree that at least we should be notified when this songs limit is reached...
Any news on this? Is it a bug or is there another limit other than the horrific 10,000 song limit? I've still not been able to transfer my starred tracks to Your Music due to this - since Starred beckame useless when starring of tracks was buried and no longer easily accessed nor displayed in playlists artist pages. I have 8,300 songsa and can no longer save...
The limit isn't 10,000 songs, it is 10,000 items. So if you save a lot of albums an album counts as the number of tracks on the album + 1 (the album itself) which gives you less than 10,000 songs - although I would think 8,300 is still a little low.