Stats missing after upgrading to 1.8.3

Just upgraded from 1.8.1 to 1.8.3 a couple of days ago. Upgrade went fine, no problems.

Today I noticed that the visits for yesterday are zero (there were definitely visits). The list of keywords is empty, as well as list of external websites, visits by server time, visits by local time and probably a few others…

Any way to check what’s going on??

UPDATE:
ok - I think it was the archiving job… turned it off in favour of Allow Piwik archiving to trigger when reports are viewed from the browser. Looks fine now.