I suspect there is something wrong with your system. Works for me almost anything "out of the box". I use TC 3.5.1.
I need some help here please: How to make sure that I see the TC app icons on the bottom?
I'm assuming that you mean "panel 2". There, I have TC icons for "AppBrowser", "Control Panel" and "AppsAudit". All icons work as expected.
I have problems to exit. that exit button seems to be not working in Xfce
I have 2 "TC exit icons". One on the desktop and one in "panel 1". Both work as expected.
I also can not see my "on demand" applications frm Xfce and do not know how to start them from the GUI
I found all my OnDemand apps in "panel 1" -> "Applcation Menu" -> "Sontiges" (I have locale=DE, in locale=c there it is probably "others")
on some Pcs the Xburner does not work. I can select the items to burn but when I try to hit
the continue to burn button the on screen box is empty.
I have Xburner not been tested.