do you get any error messages?check the programs what or which you installed lately,(not from MDK 9.2 CDs)I believe that a program or software blocks the soundcard working!because I have had many sound problems!last one was one program caused it and I found out by uninstalling the programs what or which I had installed by one by and everytime I do that,I restarted the computer and finally sound was working!try to do that or find out what program you installed last or lately,I am sure this will solve the problem,by the way this not MDK's bug
one bad program parameters or file cause that.I know you don't say that!