If startup fails with an error "OverflowError: argument number 7:
value -9223372036854775807 is less than 'int' minimum -2147483648",
it is caused by a bug in wxPython 64-bit systems. To get around the bug,
insert the following line in the file options.py at line 30.
sys.maxint = 2147483647 # avoids bug in wx.SpinCtrl on 64-bit systems