Some additional info regarding graphical glitches:
Another player on my server is running Windows7 pro with an AMD R9 m290x with drivers up to date. He reported that his screen turned red when it rained but he disabled refractions in the game settings and the problem went away. He also cannot view rain through a glass window. I do not know if this behavior changed from before the 0.8.0.1 patch
Yet another player started a single player game on 0.7.4 and throughout the updates, he can see rain through a window. However, on a new game Oddly enough, for him in single-player mode, the rain is visible through a window on a converted world (created with 0.7.4) but on a new world in single player (created with 0.8.0 (just before the latest patch) ) the rain is not visible through the glass. He is running the latest RW version and has Windows 8.1 with an nvidia 880m. For additional strangeness, he cannot see the rain through a window on my multiplayer server. I dont know when my world was initially created. but its older than 0.7.4
For me, I've noticed the glass texture doesnt affect whether rain is visible. I've also noticed I can see the rain through the glass while I am positioning the pane but once I actually set the glass pain, the rain effect disappears. I am running win10 pro with a nvidia gtx 960