Just grabbed it and still crashes on fullscreening with:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x186238744 __pthread_kill + 8
1 libsystem_pthread.dylib 0x18626fc28 pthread_kill + 288
2 libsystem_c.dylib 0x18617dae8 abort + 180
3 libc++abi.dylib 0x186228b84 abort_message + 132
4 libc++abi.dylib 0x1862183d0 demangling_terminate_handler() + 348
5 libobjc.A.dylib 0x185eeee58 _objc_terminate() + 144
6 libc++abi.dylib 0x186227f48 std::__terminate(void (*)()) + 16
7 libc++abi.dylib 0x18622af44 __cxa_rethrow + 148
8 libobjc.A.dylib 0x185f015cc objc_exception_rethrow + 44
9 AppKit 0x1895b7254 NSPerformVisuallyAtomicChange + 144
10 AppKit 0x1895b70e4 -[NSWindow setStyleMask:] + 188
11 libRack.dylib 0x100d4cc5c _glfwSetWindowDecoratedCocoa + 100
12 plugin.dylib 0x10c73323c ProjectMRenderer::setNoFrames(bool) + 120
13 plugin.dylib 0x10c72e360 BaseProjectMWidget::step() + 384
14 libRack.dylib 0x100c816e8 rack::widget::Widget::step() + 64
15 libRack.dylib 0x100c816e8 rack::widget::Widget::step() + 64
16 libRack.dylib 0x100c816e8 rack::widget::Widget::step() + 64
17 libRack.dylib 0x100c816e8 rack::widget::Widget::step() + 64
18 libRack.dylib 0x100c816e8 rack::widget::Widget::step() + 64
19 libRack.dylib 0x100c816e8 rack::widget::Widget::step() + 64
20 libRack.dylib 0x100c7a4c8 rack::ui::ScrollWidget::step() + 24
21 libRack.dylib 0x100c37278 rack::app::RackScrollWidget::step() + 560
22 libRack.dylib 0x100c816e8 rack::widget::Widget::step() + 64
23 libRack.dylib 0x100c420a0 rack::app::Scene::step() + 340
24 libRack.dylib 0x100c8665c rack::window::Window::step() + 1596
25 libRack.dylib 0x100c86008 rack::window::Window::run() + 40
26 Rack 0x1001a27e0 main + 3428
27 dyld 0x185f17f28 start + 2236