Yes it's most likely an issue with forward+, I would use compatibility mode if possible as it can run on more hardware, but it also disables some features, especially ones that are more commonly used in 3d games than 2d.
I did try using compatibility on the last day (so I could upload in browser) but I found that it really messed up my lighting and overall atmosphere, so I chose to cut it. I'll take a look into reading more about the rendering pipelines, thanks for letting me know!
