Yamaha UK have responded about retaining paths by recommending anyone who has this problem should save a system file (presumably after setting up the paths required).

Paths are now being retained on my Ty4- although I didn't save a system file.
Here is what I posted on another Forum:

"When I realised yesterday not everyone was finding this a problem I set up 2 style buttons to paths that I wanted. Turned off - but only for 2 minutes - then back on and they were retained for that time.
Tyros has been off overnight and I've just checked, the paths are still there. And I didn't make a system file. Presumably Tyros has somehow been prompted to make its own automatically, which it hadn't done before (in my case).

I seem to recall in the mists of time that on Ty3 (or Ty2) I was unable to retain paths at first, but then after a time it was no longer an issue and I didn't think any more about it- till now "

john

[This message has been edited by jwyvern (edited 11-05-2010).]