After update to v3.31 i cant start stopped torrents.
The printed error is "error writing:Operation not supported(95)" comes randomly

What OS?
are the torrents complete?
have you tried to force check the torrent?
where exactly are you seeing the error?

*** 14/12/2024 ***
[02:47:22 μμ]  loading transfer
[02:47:22 μμ]  info-hash set > 123456789ABCD
[02:47:27 μμ]  starting
[02:47:27 μμ]  downloading initiated
[02:47:28 μμ]  tracker announcing  > udp://tracker:80/announce

[02:47:29 μμ]  error writing: Operation not supported (95) > Season 1 - show title (2016) - S01E04 - Episode 4 (1080p BluRay x265 Kappa).mkv
[02:47:29 μμ]  stopping
[02:47:29 μμ]  tracker error: Cancelled > udp://tracker:80/announce

[03:10:52 μμ]  hash-check requested for all files
[03:10:52 μμ]  waiting to check files
[03:11:32 μμ]  checking files
[03:18:56 μμ]  files check complete
[03:19:24 μμ]  starting
[03:19:24 μμ]  downloading initiated
[03:19:24 μμ]  tracker announcing  > udp://tracker:80/announce

[03:19:24 μμ]  error writing: Operation not supported (95) > Season 1 - show title (2016) - S01E04 - Episode 4 (1080p BluRay x265 Kappa).mkv
[03:19:24 μμ]  stopping
[03:19:24 μμ]  tracker error: Cancelled > udp://tracker:80/announce

Forgot to add that OS is Ubuntu Mint 24.04.1 Cinnamon

Will someone do something, is getting annoying!

*** 18/12/2024 ***
[05:30:54 μμ]  creating transfer from hash link
[05:30:54 μμ]  starting
[05:30:54 μμ]  info-hash set > 123456789ABCDEFGH
[05:30:54 μμ]  downloading initiated
[05:30:54 μμ]  tracker announcing  > udp://tracker:80/announce

[05:30:55 μμ]  tracker responded OK, returned=47  seeds=40  peers=7  interval=28:55 > udp://tracker:80/announce

[05:31:01 μμ]  starting DHT search
[05:31:02 μμ]  tracker error: Timed out (110) (cached) > udp://tracker:80/announce
[05:31:02 μμ]  file download priority set to Off > file.txt
[05:31:03 μμ]  file download priority set to Off > Title S06E09 Episode 1080p DSNP WEB-DL DDP5 1 H 264-NTb.nfo
[05:31:04 μμ]  tracker error: Timed out (110) (cached) > udp://tracker:80/announce

[05:31:05 μμ]  file download priority set to Off > file.mkv
[05:31:08 μμ]  downloading initiated
[05:31:08 μμ]  found new file with LM time 2024/12/03 05:29:16 μμ > Title S06E09 Episode 1080p DSNP WEB-DL DDP5 1 H 264-NTb.mkv
[05:31:08 μμ]  waiting to check files
[05:31:08 μμ]  checking files
[05:31:32 μμ]  error writing: Operation not supported (95) > Title S06E09 Episode 1080p DSNP WEB-DL DDP5 1 H 264-NTb.mkv
[05:31:32 μμ]  stopping
[05:31:32 μμ]  files check interrupted
[05:31:32 μμ]  tracker announcing  > udp://tracker:80/announce

[05:31:33 μμ]  tracker responded OK > udp://tracker:80/announce

[05:31:51 μμ]  starting
[05:31:51 μμ]  downloading initiated
[05:31:51 μμ]  waiting to check files
[05:31:51 μμ]  checking files
[05:32:17 μμ]  waiting to check files
[05:32:17 μμ]  checking files
[05:32:39 μμ]  files check complete
[05:32:40 μμ]  tracker announcing  > udp://tracker:80/announce

[05:32:40 μμ]  tracker responded OK, returned=11  seeds=9  peers=2  interval=3:00:00 > udp://tracker:80/announce

[05:32:47 μμ]  starting DHT search
[05:32:51 μμ]  file complete > Title S06E09 Episode 1080p DSNP WEB-DL DDP5 1 H 264-NTb.mkv
[05:32:51 μμ]  complete
[05:33:06 μμ]  tracker error: Timed out (110) > udp://tracker:80/announce

What version did you update from?  Was it v3.29?

Just trying to narrow it down....

OP, are you using a network drive or an unusual file system on that machine?

The developer thoroughly checked this out today and reports that he couldn't find anything yet.

What might help is looking at the file activity log, which is accessed from the main window Help button (top right corner) then from the dropdown menu > Diagnostics > File Activity Log.

If you can catch when this is happening and send a partial File Activity Log that captures the write error, we will give it our best effort to figure this out.

If anyone else has run into this error, please speak up!  Any further info would be very helpful.