You may sometimes see an error dialog:
If you click on Details you then see “breeze error: Error: Illegal construction – use ‘or’ to combine checks”:
This happens mostly when you first login and seems especially prevalent with the latest version of Chrome, version 33.
The message is a nuisance that poses no problems for your data: simply refresh the web page. We apologize for the inconvenience.
We are working hard to find the cause and fix it.