All Platforms
Fixed a 4.1.0 bug that failed to report some filesystem errors to RPC clients who were querying the system's free space available. (#8258)
Fixed a 4.1.0 bug that kept a a torrent's updated queue position from being shown. (#8298)
Fixed a 4.1.0 bug that caused torrents' queuing order to sometimes be lost between sessions. (#8306)
Fixed "assertion failed: no timezone" error on OpenSolaris. (#8358)
Fixed a 4.0.0 bug that displayed the wrong mime-type icon for mp4 video files. (#8411)
Hardened .torrent parsing by exiting sooner if pieces has an invalid size. (#8412)
Reverted a 4.1.0 RPC change that broke some 3rd party code by returning floating-point numbers, rather than integers, for speed limit fields. (#8416)
Fixed crash that could happen if a user paused a torrent and edited its tracker list at the same time. (#8478)
Fixed 4.1.0 crash on arm32 by switching crc32 libraries to Mark Madler's crcany. (#8529)
Require UTF-8 filenames in .torrent files, as required by the BitTorrent spec. (#8541)
Fixed crash that could occur when parsing a .torrent file with a bad pieces key. (#8542)
Fixed potential file descriptor leak when launching scripts on POSIX systems. (#8549)
Changed the network traffic algorithm to spread bandwidth more evenly amongst peers. (#8259)
Improved laggy user interface when bandwidth usage is high. (#8454)
macOS Client
Fixed a 4.1.0 crash that occurred if deleting a torrent's files on macOS returned a system error. (#8275)
Fixed a crash in the "Rename File ..." dialog when trying to rename a torrent right when the torrent finished downloading. (#8425)
Fixed 4.1.0 crash when removing a torrent that was being show in the Inspector. (#8496)
Improved performance of internal Torrent lookup code. (#8505)
Improved responsiveness when scrolling the torrent list with keyboard navigation. (#8323)
Qt Client
Fixed a 4.1.0 bug where the RPC error response arguments were not handled. (#8414)
Fixed a long-standing bug that wouldn't let file:/// URIs be added from the command line. (#8448)
Fixed broken icons in the torrent list on Windows. (#8456)
GTK Client
Fixed a 4.1.0-beta.5 assertion failure when fetching a blocklist failed on a system compiled with GLIBCXX_ASSERTIONS enabled. (#8273)
Fixed a 4.1.0 bug that wouldn't let magnet links be added from the "Add URL" dialog. (#8277)
Fixed a 4.1.0 bug that broke keyboard shortcuts when built with GTK3. (#8293)
Fixed a crash that could happen when removing some torrents. (#8340)
Fixed a 4.1.0 bug that showed the wrong encryption mode being shown in the Preferences dialog. (#8345)
Fixed a 4.0.x bug that prevented a handful of strings from being marked for translation. (#8350)
Fixed a 4.1.0 packaging error that prevented the Qt and GTK clients from being installed side-by-side on Arch. (#8387)
Fixed a 4.1.0 bug that wouldn't let magnet links be added from the command line. (#8415)
Web Client
Reverted a 4.1.0 change that merged the "Remove torrent" and "Trash torrent" confirmation dialogs into a single dialog. (#8355)
Fixed a 4.1.0 bug that showed a "Connection failed" popup when opening the "Open torrent" dialog while the current download directory path was invalid. (#8386)
Everything Else
Updated documentation. (#8245, #8526)

All Platforms
Fixed a 4.1.0 bug that failed to report some filesystem errors to RPC clients who were querying the system's free space available. (#8258)
Fixed a 4.1.0 bug that kept a a torrent's updated queue position from being shown. (#8298)
Fixed a 4.1.0 bug that caused torrents' queuing order to sometimes be lost between sessions. (#8306)
Fixed "assertion failed: no timezone" error on OpenSolaris. (#8358)
Fixed a 4.0.0 bug that displayed the wrong mime-type icon for mp4 video files. (#8411)
Hardened .torrent parsing by exiting sooner if pieces has an invalid size. (#8412)
Reverted a 4.1.0 RPC change that broke some 3rd party code by returning floating-point numbers, rather than integers, for speed limit fields. (#8416)
Fixed crash that could happen if a user paused a torrent and edited its tracker list at the same time. (#8478)
Fixed 4.1.0 crash on arm32 by switching crc32 libraries to Mark Madler's crcany. (#8529)
Require UTF-8 filenames in .torrent files, as required by the BitTorrent spec. (#8541)
Fixed crash that could occur when parsing a .torrent file with a bad pieces key. (#8542)
Fixed potential file descriptor leak when launching scripts on POSIX systems. (#8549)
Changed the network traffic algorithm to spread bandwidth more evenly amongst peers. (#8259)
Improved laggy user interface when bandwidth usage is high. (#8454)

macOS Client
Fixed a 4.1.0 crash that occurred if deleting a torrent's files on macOS returned a system error. (#8275)
Fixed a crash in the "Rename File ..." dialog when trying to rename a torrent right when the torrent finished downloading. (#8425)
Fixed 4.1.0 crash when removing a torrent that was being show in the Inspector. (#8496)
Improved performance of internal Torrent lookup code. (#8505)
Improved responsiveness when scrolling the torrent list with keyboard navigation. (#8323)

Qt Client
Fixed a 4.1.0 bug where the RPC error response arguments were not handled. (#8414)
Fixed a long-standing bug that wouldn't let file:/// URIs be added from the command line. (#8448)
Fixed broken icons in the torrent list on Windows. (#8456)

GTK Client
Fixed a 4.1.0-beta.5 assertion failure when fetching a blocklist failed on a system compiled with GLIBCXX_ASSERTIONS enabled. (#8273)
Fixed a 4.1.0 bug that wouldn't let magnet links be added from the "Add URL" dialog. (#8277)
Fixed a 4.1.0 bug that broke keyboard shortcuts when built with GTK3. (#8293)
Fixed a crash that could happen when removing some torrents. (#8340)
Fixed a 4.1.0 bug that showed the wrong encryption mode being shown in the Preferences dialog. (#8345)
Fixed a 4.0.x bug that prevented a handful of strings from being marked for translation. (#8350)
Fixed a 4.1.0 packaging error that prevented the Qt and GTK clients from being installed side-by-side on Arch. (#8387)
Fixed a 4.1.0 bug that wouldn't let magnet links be added from the command line. (#8415)

Web Client
Reverted a 4.1.0 change that merged the "Remove torrent" and "Trash torrent" confirmation dialogs into a single dialog. (#8355)
Fixed a 4.1.0 bug that showed a "Connection failed" popup when opening the "Open torrent" dialog while the current download directory path was invalid. (#8386)

Everything Else
Updated documentation. (#8245, #8526)