Aegisub 3.5.1 Changelog

Released: October 17, 2026

Fix a crash on startup on macOS 13 and other macOS releases with an older system libc++.
Allow Automation scripts to load native modules that aren’t signed by Aegisub’s developer again.
Report macOS 11 and later correctly to the update checker.

Fix controls in script dialogs coming out smaller than intended with newer wxWidgets versions.
Make include() and require() report the actual syntax error for broken Lua and MoonScript files, rather than the module name or “attempt to call a nil value”.
Fix runtime errors in scripts loaded with include() crashing Aegisub on some platforms.
Fix detection of files starting with a UTF-8 BOM on platforms where char is unsigned.
Add aegisub.version, which lets scripts check the version of Aegisub they’re running in.

Fix a crash when the video display keeps failing to render, e.g. due to a persistent OpenGL error.
Make changing underline in the font dialog set \u rather than toggling italics.
Fix the LayoutResY computed when resampling a script that has a LayoutRes while adding or removing top or bottom borders.

Let the video, audio, keyframe, and timecode file dialogs start in the current script’s folder when the last such file was opened from its script’s folder.
Show each track’s language and title in the track selection dialog.
List only the file types the active audio and video providers support in the file dialogs’ filters.