Is the minimum and maximum brush size for pressure sensitive tablets disabled in the trial version? It allows me to choose a minimum and maximum size, but there is no dot in the middle of the gray circle for the minimum size, and brush line is always one thickness.
The pressure sensitivity is only working for brush lines not pencil lines. If your brush does not apply the pressure sensitivity then uninstall all tablet drivers and tablet preference files from your system. Reboot after doing this and download the latest tablet driver. Use the tablet driver’s utility program to define your new tablet preferences.
Note that changing your screen display resolution may again unset your tablet’s preferences. It is fairly rare but has been known to happen.