I've just released an update to Radio Downloader. This resolves the AAC stream download issues experienced by non-UK users since the 20th May, and the problem of older downloads hanging and blocking newer downloads.
This release also brings customisable, sortable columns in the Downloads view which remember their chosen order and widths, as well as an optional new 'Duration' column. Status information is now displayed in Windows 7 using taskbar overlays.
There are quite a number of fixes for a range of other bugs, which are listed in the changelog.