Kenny,
The High-Compatibility/High-Performance/Medium-Quality/High-Quality options in the previous versions were just varying configurations on the options provided in version 5, so we just decided to get rid of those and just give you the options directly, partly because options like High Performance often ran slower than High Quality, etc., so the options were a bit deceptive anyway.
The options are explained in pretty good detail if you mouse-over them and read the pop-up hint text. Are there specific questions you have that the hint text doesn't explain? For Texture Magnification, if you choose GL_NEAREST, then you'll notice when you zoom in really close to textured objects, you can actually see individual pixels in the texture, whereas if you choose GL_LINEAR and zoom way in, you'll see that it interpolates an individual pixel, so it looks smoother. For Texture Minification, if you choose GL_NEAREST and then zoom way out, you'll notice that textured objects "shimmer" as you're zooming or panning, whereas if you choose GL_LINEAR_MIPMAP_LINEAR, the objects don't shimmer. The Texture Minification hint doesn't explain all of the options. I don't know exactly what all the options mean, but it should suffice to say that GL_LINEAR_MIPMAP_LINEAR is highest quality/slowest, while GL_NEAREST is lowest quality/fastest, and all the others are somewhere in between those two. Although some graphics cards are optimized to do GL_LINEAR stuff just as fast (or maybe even faster) than GL_NEAREST, so it all depends on the hardware.
As far as why stuff isn't working, choosing the "High Compatibility" option in version 4.x essentially was the same as checking the "Compatibility Mode" box in version 5. After that, all of the other options shouldn't change much whether the model renders wrong or right (it seems to me from your description that the model is rendering wrong, in which case you need to choose compatibility mode), they will just be slight modifications to rendering quality, performance and memory usage, etc. Although you never know, there are so many different card/driver configurations, it's hard to "guarantee" my last statement.
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