Operating system: Darwin-18.7.0-x86_64-i386-64bit 64 Bits
Graphics card: NVIDIA GeForce GT 750M OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-12.0.24 3188.8.131.52.10.103
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Short description of error
custom icons of addons don't load. they show blank
Exact steps for others to reproduce the error
Only on my Mac I have this problem. Windows, Linux no. Also they show in 2.81 branch (Mac). I currently have 2 addons that have the same behavior.