Bug?? in TDE 3.13.2 on Wheezy

Hello, everyone :-) I think I may have hit a bug. It seems unlikely since it is a very conspicuous one, but perhaps I'm the only one using the desktop in exactly my way. It has two manifestations, one the exact opposite of the other. The two machines in question are: one running TDE 3.5.2 on Wheezy, recently upgraded from Squeeze; the other a fresh installation of both TDE 3.5.2 and Wheezy. Now, what happens: Configure desktop -> Behaviour -> General -> Show icons on desktop: checked. Configure desktop -> Behaviour -> Device Icons -> Show device icons: checked. If I uncheck the boxes, then click apply, the display briefly disappears, the status quo ante is not changed, and the checks both reappear. Now, where the two computers differ. On the one that has recently been upgraded there are no desktop icons whatever I do, and on the fresh install I cannot get rid of the icons. Help!! Can anyone solve it? Or should I file a bug? Lisi