Thanks for your extra, really helpful!
I just had to pull some hair for 2 days now, because I could get it to work everywhere, just not in one installation...the problem was content like the following in the Instructions field of the release:
<p>Put the snippet in your template like</p><p><script src="[[!SnippetName:tag? &output=`js` &targetfile=`scripts.combined.min` &targetpath=`assets/site/js/` &sources=`https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false,https://stats.g.doubleclick.net/dc.js,assets/site/js/` &checkremote=`0` &cleanup=`1` &devmode=`0` &debug=`1`]]" type="text/javascript"></script></p><p>or indirectly like</p><p>[[!SnippetName:tag? &output=`css,js` &targetfile=`styles.combined.min,scripts.combined.min` &targetpath=`assets/,assets/` &sources=`assets/site/css/,assets/site/js/` &recursive=`0` &checkremote=`0` &disable=`0` &cleanup=`1` &toplaceholder=`1` &pxbase=`10` &devmode=`0` &debug=`1`]]</p><p><script src="[[+css]]" type="text/javascript"></script><br><script src="[[+js]]" type="text/javascript"></script></p>
I just found this out, because suddenly I had some XML Errors in the log, no idea where they came from, cannot get them anymore, would post if they come again^^...
The problem was, that the package overview (modRepositoryHome) was showing correctly but as soon as I clicked on the package to download it, the grid/list went empty...in the log I had "could not connect to provider "...but this was just the result of the error generated by something that tried to output that content above...