The beta version of thinstation has a permissions problem on some keymap files that does bad things to rdesktop sessions, at least with en-us. The arrow keys stopped working along with the page up, page down, home, end, etc. The number pad keys worked in navigation mode only.
Here is a simple fix, if you have a local build folder.
As root:
cd <path to thinstation folder>
find packages/keymaps-* -perm 0600 -print|sort|xargs chmod 644
./build
