So, I have stumbled upon two problems with the latest Minetest 0.4.4.
First of all, when I went into Redcrab's server after updating my client, I found that I can not disable the texture atlas (it got filled up and texture errors began). I tried setting enable_texture_atlas to 0 and false, neither work.
Same with sound, I wanted to listen to Metallica music while mining, but I found that it is impossible to disable sound via the .conf file. Tried setting enable_sound to 0 and false.
Using Minetest 0.4.4, Windows Vista 32-bit.