Crystalfontz serial display *empty* when compiling from DC 10.46(ok in DC 10.21)

In DC 10.46 the bios is a little larger, but this release seems to solve some bugs related to web development in dynamic c…
The program works perfectly with DC 10.21 (on RCM4000),
in DC 10.46 the program is able to receive the key events and to set to on or off the 8 leds on the display, but no text is displayed on the display :frowning:
Something is changed from 10.21 about serial ports handling?