I can't tell if it's the use of cureRom or not, but it's right that since i started to use it, my virtual drive letters are often reinitialized to the first available letters.
I'm always using the letters W, X, Y, Z for the 4 daemon virtual drives but it often happens that they come back to the firsts available letters in my system (g,h,i,j).
I'll try to note if it comes with cureRom use or not...