While I don't have any Open GL problems (I have an ATI Radeon 9700) I was curious & tested the GLDirect4 using emulation via T&L Hardware aceleration and DirectX9 - the most "accelerated" settings for DirectX that my card can use (or any current directX capable card for that matter)
Using a fairly complex test model, I discovered the result indeed works, but is VERY much slower and chews up a lot more RAM.
On an older card, I imagine this emulation performance would be even worse.
Based on that, I think if you have OpenGL problems with your current card, you are better off simply coughing up for at least a high end "gaming" card like Ati Radeon 9700 or 9800 Pro, or Nvidia FX 5800 or FX5900 - which all handle OpenGL very well.
Would be interested to hear others experiance?
Octane Render Plugin for ArchiCAD
Intel Core i9 10900K
Nvidia Gforce RTX 3080
32 Gb DDR3
2x4K 42" monitor extended desktop