If you don't already have version 4.72 build 154, try updating your copy of the program. You can get the latest version of Acoustica MP3 CD Burner here
There is no additional charge for updating the software. In MP3 CD Burner, click on the File menu, select Preferences, and in the General preferences, select "Primo." In the CD/DVD Burner preferences, make sure "Use IMAPI..." is turned off. Click OK to save these settings and see if the problem is fixed.