eshmx

Hello everyone, I bought a MD about 3 years ago, I do not remember the modelo, then las year bought a newone but Idid not install the 1.5 sonic stage instead, I installed the 4.3 version and at the begining it was working fine, however these hollydays I bought nore MDs and then the problem began, when I tried to record the songs there is a message that says "can not import the selected tracks" and then It gives me some reasons but the strange is that I tranfered those songs before with the same software, computer and MD, I try to reconvert the files in mp3 however the problem presists, can anyone help me with this problem? Thanks