First time you open the GUI it works fine. After closing and re-opening the UI I get errors like this: ``` suil error: Failed to instantiate UI <http://gareus.org/oss/lv2/avldrums#ui_gl> in /usr/lib/lv2/avldrums.lv2/avldrumsUI_gl.so ``` and with ZynAddSubFx, I get a segfault for a null pointer, see attached backtrace. ``` #0 DGL::puglGetNativeWindow (view=0x0) at /usr/src/debug/zynaddsubfx/zynaddsubfx-3.0.6/DPF/dgl/src/pugl-upstream/src/x11.c:1287 1287 return (PuglNativeView)view->impl->win; [Current thread is 1 (Thread 0x7f7083fbcb00 (LWP 12))] ``` (seems like there's a NULL object here) I don't know if the Zynaddsubfx are suil related, but I've seen a [similar issue](https://gitlab.com/lv2/suil/-/work_items/7) opened in the past, so I thought it could be the case. If this is not the right place feel free to close. [backtrace.txt](/uploads/e104b7abe8abb392497d8f78772db8e5/backtrace.txt) OS: Arch Linux Ardour: 9.2 Suil: 0.10.26