Fixing a buzzing sound doesn't mean it will sort out the visuals though.
Latest time we had a patch was back in December, this patch updated the whole Ogre engine that the game was running on to a newer version. Some users might need to update their graphic card drivers in order for it to work, and some that has really old computers might not be able to run it at all even though they used to due to some changes to the engine used.
You "MUST" make sure that you have the more recent graphics card drivers installed because it's most likely the reason why the game looks weird or glitches on you. Hopefully you have a graphics card that's easy to update, and if you do not know how to do this yourself, possibly ask someone that knows how to do it.
If the game would still have visual glitches after the graphics card update, it could be the hardware not being able to draw the game properly.