Do the following:

create a classic tracker.

Add:

  timelog = Class(db, "timelog", period=Interval())

to dbinit.py, initalise the tracker and log in as admin.

go to the class list and edit the timelog class.
add:

   X,+ 1:10

to the window and try to save changes. You should
get the attached file whose summary is:

TypeError: new property "period" not an Interval Python 
2.2.2
/usr/bin/python2.2 

A problem occurred while running a Python script. Here 
is the sequence of function calls leading up to the error, 
with the most recent (innermost) call first. The exception 
attributes are:
      __doc__ = 'Inappropriate argument type.' 
      __getitem__ = <bound method 
TypeError.__getitem__ of <exceptions.TypeError 
instance>> 
      __init__ = <bound method TypeError.__init__ of 
<exceptions.TypeError instance>> 
      __module__ = 'exceptions' 
      __str__ = <bound method TypeError.__str__ of 
<exceptions.TypeError instance>> 
      args = ('new property "period" not an Interval',)

This is with cygwin python 2.2.2. I first discovered
this while trying to correct a null interval in the timelog
list. I went to edit it and got the same general crash.

-- rouilj