This is getting weirder and weirder.
Depending when I reload my dashboard, I am getting stats from earlier today, stats from yesterday, empty stats and so on.
If I go to a particular tab (say Visitors), the refresh of widgets ends up refreshing the dashboard widgets in yet another configuration.
It looked like Piwik was working for a while after I applied the 1.1.2b1 patch, but since this morning, it looks stuck with this refresh problem.
Edit: Now I think of it, the only thing that changed since I installed the patch is that I attempted a refresh of the reports by deleting the two _archives tables for January 2011. The tables were apparently rebuilt but I have had this refresh problem since.
Edit 2: Another observation if it can help with troubleshooting.
When I go to the Visitor Log, the page turns up blank. But if I select today’s date in the calendar (which is already set to today at this point), the page reloads with actual visits displayed.