Hmmm… I have been using it in chrome (most recent version), and it didn’t work for a long time (for any date range I have been using). Now, I have opened it in firefox to see, if it works – and it does – plus it suddenly started working in chrome. Not sure these two actions are related though. I’m also using wordpress 3.3.1 and the full (paid) version of your plugin.
I’ll let you know, if I have any more issues – right now it seems to work fine.
Cheers,
Adam