Following a discussion with in the general discussion forum, bpa suggested a quick fix to the problem with ASX playlists containing rtsp as first protocol.

The problem seems to be that the playlist is seen as empty because an URL in rtsp precedes mms and http:
Example:
  <ASX version="3.0">
  <ENTRY>
        <TITLE>Melodikrysset Del 1 av 2</TITLE>
        <ABSTRACT>Melodikrysset - l�dag 23 augusti 2008 12:06</ABSTRACT>
        <REF HREF= "rtsp://lyssna-wm.sr.se/autorec/p4/melodikrysset/srp4riks_2008-08-23_120559_1442_w4.wma"/>
        <REF HREF= "mms://lyssna-wm.sr.se/autorec/p4/melodikrysset/srp4riks_2008-08-23_120559_1442_w4.wma"/>
        <REF HREF= "http://lyssna-wm.sr.se/autorec/p4/melodikrysset/srp4riks_2008-08-23_120559_1442_w4.wma"/>
  </ENTRY>
  <ENTRY>
        <TITLE>Melodikrysset Del 2 av 2</TITLE>
        <ABSTRACT> - l�dag 23 augusti 2008 12:33</ABSTRACT>
        <REF HREF= "rtsp://lyssna-wm.sr.se/autorec/p4/melodikrysset/srp4riks_2008-08-23_123259_1622_w4.wma"/>
        <REF HREF= "mms://lyssna-wm.sr.se/autorec/p4/melodikrysset/srp4riks_2008-08-23_123259_1622_w4.wma"/>
        <REF HREF= "http://lyssna-wm.sr.se/autorec/p4/melodikrysset/srp4riks_2008-08-23_123259_1622_w4.wma"/>
  </ENTRY>
  </ASX>

bpa suggested the following fix (to at least locate the problem):

In the file Slim/Formats/Playlists/ASX.pm Add the line in red to the code starting at line 96:
Code:
---------------------------------------------------------------------------
				REF:
				for my $ref ( @{$refs} ) {
					if ( my $href = $ref->{HREF} ) {
						next if $href !~ /^(http|mms)/i;
						push @entries, {
							title => $title,
							href  => $href,
						};
						
						# Only one link in a REF station should be played
						last REF;
					}
				}
---------------------------------------------------------------------------

I would greatly appreciate if you would care to fix this!

Thanks in advance!

BR
Patrik