Cron rules not fired anymore

HI - i’m using a nightly build of openhab (openHAB 2.3.0~20180123165513-1 (Build #1194)), i upgrade system last friday and since then cron rules are not fired anymore.

Another change i made on friday, i installed my opnehab’s raspberry into a element14 piDesktop enclosure, which features an rtc hw clock.
I see that my system make normal NTP queries and so get right time data - so i think RTC clock is not involved.

Any suggestions?