PT12 crash everytime i hit record button

[fausto84]

hi everybody!
i recently upgrade PT to the 2018.12 version and it seems to work fine at first, but after a pc reboot, as i said in the title, if i hit the record button, on an audio track, it immidiatly crash and close. Also the playback function doesn' t work, it flash for a second then nothing happen.
My setup:
PC tower intel i5 with Win10
focusrite scarlett 18i8

things i tryed:
-unplug the audio interface and use the general audio driver (both windows and ASIO4ALL);
-unistall the new PT version and reinstall the previous one (2018.10);
-search on internet and in this forum about similar case;
-create a case on my account profile (by now any answer)

can you help me find a way to solve this problem??

thanks!!!!

Fausto from Italy