I have some plants I purchased, which seem to render improperly in Alchemy.
The root prim of these plants is a cube prim which has the Default Transparent Texture set to them. In addition, they have their alpha mode set to Alpha Masking.
Whenever these plants get reduced to a lower LOD level from distance, the cube prim suddenly becomes visible as a white cube, as though its alpha mode were set to None.
The issue does not occur in other viewers.
Alchemy 5.0.6 (41161) (x64) Jul 24 2017 20:06:35 (Alchemy Release)
CPU: AMD FX(tm)-8350 Eight-Core Processor (2100 MHz)
Memory: 15953 MB
OS Version: Linux 4.11.12-1-MANJARO #1 SMP PREEMPT Fri Jul 21 08:51:46 UTC 2017 x86_64
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GTX 950/PCIe/SSE2
OpenGL Version: 4.5.0 NVIDIA 375.82
Window size: 1920x999
Font Size Adjustment: 96pt
UI Scaling: 1
Draw distance: 256m
LOD factor: 2
Render quality: 5 / 7
Advanced Lighting Model: Enabled
Texture memory: 2048MB
VFS (cache) creation time: August 11 2017 07:48:51
HTTP Pipelining: Disabled
libcurl Version: libcurl/7.54.1 OpenSSL/1.1.0f zlib/1.2.11
J2C Decoder Version: OpenJPEG: 1.5.1, Runtime: 1.5.0
Audio Driver Version: FMOD Studio 1.09.05
Font Renderer: FreeType 2.7.1
LLCEFLib/CEF Version: 1.6.0-(CEF-LNX-3.3071.1640.g1ebbf3c)
LibVLC Version: Undefined
Voice Server Version: Not Connected
Built with Clang version 3.8.0 (tags/RELEASE_380/final)
August 11 2017 07:52:21