Why did I do it!
Had a perfect setup using a ReadyNas Duo in conjunction with a Logitech Squeezebox Duet and Radio in conjunction with LMS 7.7.1. Saw there was an update to LMS 7.7.2 so attempted to install using these instructions (http://logitech-en-amr.custhelp.com/app ... a_id/12125) on Logitech website. After install couldn't see the Squeezecenter in ReadyNAs Streaming Services so installed again. Then found post on this forum that clarifies service moved to Add-On menu. LMS is there but neither players can play my music library any more. Have done a factory reset on the Radio but when I go to My Music it says the library is empty. I'm not sure if this is because there is a rescan of the library being done (27,000+ songs) which will presumably take some time or whether something is broken. When I select Settings/Advanced/Squeezebox Information on the player it lists the LMS correctly so I know the connection to the LMS is working.
Any suggestions? Can I go back to LMS 7.7.1 if problem doesn't resolve itself!
(Why are these updates never straight forward!)
Updated 18 June 2012
My pessimism was miss placed! - Scan eventually finished after about 8 hours and everything now working!
However, this does raise another question. With previous versions of LMS, if I added new tracks to music folder I needed to perform a rescan of LMS library before the tracks would be available via players. Scan took a long time but I could still play other tracks while it was being done. Given experience above, is that still the case with LMS 7.7.2 or is connection to LMS lost while scan is performed?