Pokemon Stadium 2: Blending Mode problem

Running it with my Geforce 2 GTS card using Detonators XP 29.42 (it was in all the pervious versions as well) requires me to check the "Change Blending Mode if invalid for video card" (That is PJ64 1.5 beta 1 and Jabo's D3D7 1.40 plugin). The problem was in 1.4 though, so it must be GFX card related. But what's strange, my friend has a GTS as well and it works fine for him. The Change blending mode slows down the battles to half-speed.
My question is...it is possible to make it select the correct blending mode (as with the checkbox enabled, the plugin finds the correct blending mode normally). Or at least make it so that the checkbox will be unneeded

i have various blending bugs, such as:

- when the teacher in the Library/Academy asks a question, the text is unseen and so are the answers. With the switch on, it has some bugs (no texture behind it) but it's readable at least.

- Various effects in the battle opening scene and in the battle itself have gfx bugs, this fixes it (but also slows the game to half speed)