Glow no longer works unless ALM is enabled.
I am filing this on behalf of Beware Hax, whose Atlassian login is broken, and if I recall correctly, a couple of issues that arise from this are lowered frame rate and increased gpu temperature, which are expected with ALM enabled, or at least with subcomponents of ALM such as shadows, but which are avoided when glow can be enabled without ALM in play. Beware wasn't around while I was making this, and my own system can't do ALM at all, but I gathered environment info from others to fill out that part, to show that it is a cross-platform repro.
This issue has been reproduced on both Windows and Linux OS:
CPU: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz (3417.88 MHz)
Memory: 8137 MB
OS Version: Microsoft Windows 7 64-bit Service Pack 1 (Build 7601)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GTX 560/PCIe/SSE2
Windows Graphics Driver Version: 21.21.0013.7270
OpenGL Version: 4.5.0 NVIDIA 372.70
RLV Version: (disabled)
CPU: AMD FX(tm)-8320 Eight-Core Processor (2900 MHz)
Memory: 4194303 MB
OS Version: Linux 4.7.6-hardened #1 SMP Mon Oct 3 15:37:04 CEST 2016 x86_64
Graphics Card Vendor: X.Org
Graphics Card: Gallium 0.4 on AMD HAWAII (DRM 2.45.0 / 4.7.6-hardened, LLVM 4.0.0)
OpenGL Version: 3.0 Mesa 12.1.0-devel (git-74b02a7)
Bug still present in 6905 alpha. Glow does however work if you enable ALM.