Aborting downloads problem (slsk2015.8.3, Windows 10, with log)

I've just seen a problem where all the files in a folder I queued for download went to aborted straight away, not something I've seen before myself. The log seems to repeat this sort of thing:

[Thu Oct 8 09:00:17 2015] Received PM_TRANSFER_REQUEST message from user ImipolexG
[Thu Oct 8 09:00:17 2015] Send PM_TRANSFER_RESPONSE message to user ImipolexG
[Thu Oct 8 09:00:17 2015] Found one existing messaging connection to user
[Thu Oct 8 09:00:18 2015] HandleMessage on uninitialized socket: 0x6470538
[Thu Oct 8 09:00:18 2015] Accepted obfuscated file connection to user ImipolexG
[Thu Oct 8 09:00:18 2015] Peer obfuscated connection of type F opened from user ImipolexG
[Thu Oct 8 09:00:18 2015] Indirect obfuscated peer connection requested from user ImipolexG
[Thu Oct 8 09:00:18 2015] Received PM_UPLOAD_FAILED message from user ImipolexG
[Thu Oct 8 09:00:18 2015] Response obfuscated connection to indirect request from ImipolexG, type F opened
[Thu Oct 8 09:00:18 2015] Disposing of socket
[Thu Oct 8 09:00:18 2015] Socket not identified
[Thu Oct 8 09:00:19 2015] Received PM_TRANSFER_REQUEST message from user ImipolexG...

and it repeats, just the socket number changes. Any ideas?