Zyn-Fusion's GUI is black when the LV2 version is opened in Qtractor

[maxigaz]

The GUI of Zyn-Fusion is completely black if I open it in Qtractor.

This happens with the following software setup:

• Arch Linux + i3-gaps
• LV2 development version of Zyn-Fusion 3.0.7, compiled and installed through these scripts
• Qtractor 0.9.25.r7.ga2bad068d, installed through the AUR package qtractor-git, and 0.9.26, installed through the official Arch package qtractor

The issue happens even though I made sure to run install-linux.sh, as it was suggested in the README.

The issue doesn't happen with the following versions:

• VST dev version run in Qtractor
• LV2 dev version run in Ardour
• standalone dev version
• v3.0.6 (installed from the Arch repos as zynaddsubfx.

[fundamental]

Based on the rncbc/qtractor discussion it looks like this issue may be difficult to replicate.