In defence of Active Silicon - they have been very proactive in working to try and find an exact cause to the damaged cards - with the limited information available and without having access to the 'actual' touring system.
I asked those involved for information when the first 5 cards were returned back in March (2010) and little was forthcoming.
Active Silicon have replaced all the cards returned from the tour, without question, whilst still trying fault-find a problem that may not, ultimately be their responsibility.
Others of us have also been proactive in finding possible solutions:
http://www.bal.co.uk/cgi-bin/cp-app....s_transformers
http://www.bal.co.uk/cgi-bin/cp-app....0&cat=&catstr=
http://www.bal.co.uk/cgi-bin/cp-app....0&cat=&catstr=
http://www.bal.co.uk/cgi-bin/cp-app....SSORIES:ACCGLE
http://www.bal.co.uk/cgi-bin/cp-app....SSORIES:ACCHEC
http://www.allenavionics.com/AVI_Trans/AVI_Trans.htm
http://www.oxygendct.com/acatalog/Digital_Widgets.html
http://www.oxygendct.com/acatalog/SD...Isolators.html
http://www.len.co.uk/
http://www.len.co.uk/products.php?category_id=2
http://www.miranda.com/FOE-171p
http://www.miranda.com/FOE-171p
As yet - I've not tested these...
I actually have one of these returned 'repaired' cards - and have still not managed to break it yet....
There are hundreds of identical cards in system around the world that work perfectly and do not experience any of the issues that have arisen on Muse.
I urge users to post their findings to see if similar issues have ever occured with other D20-PE4 cards...
Simon