We are having trouble reproducing this issue but see that others are having it also. If you can, please disclose the source of the mp3. Is it a fully licensed track you purchased or something you downloaded from somewhere you plan to use as a temporary track? Please let me know so I can file an appropriate bug. Please also, if possible, attach the file so that we can have engineers inspect it. You can also send me a PM to arrange this privately via a Dropbox or Creative Cloud link.