Resolution setting on a SunRay

Today a colleague came back after one year in germany. Now he had problems
setting the resolution to 1600x1200 on the SunRay with the new TFT we got
during the year.

I deleted all settings from the SunRay 4 Database and from the SmartCard-Token, but it was not possible to show the 1600x1200 over the whole screen.
The desktop was only shown on about 2/3 of the screen.

After changing the SmartCard it was possible again. It was also regardless if I switched to an other Desktop-Unit.
After using the new card everything was fine.

The other problem was to switch a Desktop-Unit as Card-Reader. This required a cold restart of the SunRay-Services which was not possible during the day.