I got a reply from the Debian maintainer, Jon Dowland...He has stopped as of 2009-11-25 & Wallpaper-Tray is now un-maintained. He told me that the 0.4.X version was written in C & the newer 0.5.x version was written in C++. Not sure if that is causing the current problems, but could be a reason why the 0.4.X version still works.....
His respond: > Hello,
I maintained wallpaper-tray in Debian from 2007-02-05 until 2009-11-25. Ubuntu initially took the package from Debian.
The version I packaged was 0.4.6, which was written in C. It would appear that Ubuntu carried my package in Intrepid, but someone packaged the later C++ version for Jaunty onwards.
If you want to package it again, feel free, I don't need to have anything to do with it. The last version in Ubuntu was 0.5.5 and you can get at the package source from <http://packages.ubuntu.com/karmic/wallpaper-tray>
Good luck! I look back to Intrepid: http://packages.ubuntu.com/intrepid/wallpaper-tray & see that we still have good information on it.....Next step is to get it re-included---I have comment on ubuntu-development-list---We'll see where it goes..... As to the reference to Intrepid/Jaunty--that's where I contacted MOTU & asked for the 0.5.X version to be packaged...not sure who really did it......