# [4.0.0](https://github.com/lwouis/alt-tab-macos/compare/v3.24.1...v4.0.0) (2020-05-25) ### Bug Fixes * center-aligned layout was sometimes broken (closes [#352](https://github.com/lwouis/alt-tab-macos/issues/352)) ([e25dcd2](https://github.com/lwouis/alt-tab-macos/commit/e25dcd2)) * crash in some rare scenarios with lots of windows ([a859347](https://github.com/lwouis/alt-tab-macos/commit/a859347)) * potentially fix shortcuts not working sometimes ([8d833f5](https://github.com/lwouis/alt-tab-macos/commit/8d833f5)) * rework all multi-threading to handle complex scenarios ([d144476](https://github.com/lwouis/alt-tab-macos/commit/d144476)), closes [#348](https://github.com/lwouis/alt-tab-macos/issues/348) [#157](https://github.com/lwouis/alt-tab-macos/issues/157) [#342](https://github.com/lwouis/alt-tab-macos/issues/342) [#93](https://github.com/lwouis/alt-tab-macos/issues/93) * sometimes windows titles use the wrong font ([fa1095e](https://github.com/lwouis/alt-tab-macos/commit/fa1095e)) * update japanese localization ([acef0b2](https://github.com/lwouis/alt-tab-macos/commit/acef0b2)) ### BREAKING CHANGES * this rework should fix all sorts of issues when OS events happen in parallel: new windows, new apps, user shortcuts, etc. Here are example of use-cases that should work great now, without, and very quickly: * AltTab is open and an app/window is launched/quit * A window is minimized/deminimized, and while the animation is playing, the user invokes AltTab * An app starts and takes a long time to boot (e.g. Gimp) * An app becomes unresponsive, yet AltTab is unaffected and remains interactive while still processing the state of the window while its parent app finally stops being frozen