Most of the time when I open a data file, the "Save" button is disabled, because there is no changed data to save.  However, sometimes, "Save" is enabled, implying somthing in the data has been changed.  Sometimes I can find an automatically entered scheduled transaction, but sometimes I cannot figure out what the new data is.  There should be some way for the user to find out what has changed, what new data needs to be saved.  I also just noticed this happen with the "Undo" also still disabled.  I don't know if this is specific to whatever type of data changed, or if it is because it was not a user-initiated change.