Just noticed that the days of the week in the calendar used to pick the date for a scheduled task are wrong. e.g. for today 14 Apr 2014 it has the day of week as Tuesday instead of Monday. All days are wrong by one day.

I remembered I had changed the start of week from default Sun to Moday and I think this is the problem. I changed my start of week back to default "Sunday" and now the days are correct.