this article seems to say that he may have been ill during the Gilmour 2006 tour???
http://www.telegraph.co.uk/arts/main.jhtml?xml=/arts/2008/09/16/bmgilmour116.xml
The DVDs that came from that tour are worth owning. I especially loved the extra features showing the behind the scenes with Rick and the rest of the group travelling around. Im very much looking forward to next weeks CD/DVD release...the last Rick Wright performances captured live.