Any window that needs to connect up to web services is appearing blank in the official SL Viewer for Linux. I looked at the guide to opening ports in my firewall and that doesn't seem to have done anything to change it.
There's another person who reported a similar problem in 2017. Can anyone confirm if the information on that thread is accurate and that this is a known problem? Seems odd that there would be a bug for over 2 years and nothing being done about it.
This doesn't seem to be exclusive to Linux viewers either. Here's someone with the same problem, and they posted a screenshot.
Here's my "About" stats...
Second Life 22.214.171.1249906 (Second Life Release)
You are at 20.7, 194.7, 26.9 in Social Island 2 located at sim10281.agni.lindenlab.com (126.96.36.199:13007)
(global coordinates 261909.0, 268483.0, 26.9)
Second Life Server 2019-12-04T20:29:26.533447
CPU: Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz (2941.26 MHz)
Memory: 16001 MB
OS Version: Linux 5.3.0-26-generic #28-Ubuntu SMP Wed Dec 18 05:37:46 UTC 2019 x86_64
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GTX 1070/PCIe/SSE2
OpenGL Version: 4.6.0 NVIDIA 435.21
Window size: 1408x1136
Font Size Adjustment: 96pt
UI Scaling: 1
Draw distance: 128m
LOD factor: 1.125
Render quality: 5 / 7
Advanced Lighting Model: Enabled
Texture memory: 512MB
VFS (cache) creation time: January 10 2020 20:12:38
J2C Decoder Version: KDU v7.2
Audio Driver Version: Undefined
LLCEFLib/CEF Version: Undefined
LibVLC Version: Undefined
Voice Server Version: Vivox
Packets Lost: 31/72321 (0.0%)
January 10 2020 20:12:38