Here is some more info that my ex-tenant sent regarding the broken glass in the window and how it could've happened:
Also, on the window pane issue, I did a quick internet search and found that this does seem to be a common problem with double pane windows, due to temp changes, which would make sense because it happened in October and the outside temp may have taken a sharp drop that nite:"The actual breakage of a double glazed sealed unit often occurs due to thermal stress:
Both panes of a double glazed sealed unit experience thermally induced stresses, and when either an inner or outer pane breaks this is caused by the same conditions.
In the outer pane thermal stress is caused by solar radiation (heat from the Sun) falling on the double glazed sealed unit when the outdoor air is cool. Double glazed sealed units located on the south elevation experience their maximum thermal stress in Winter. Coloured sealed units (particularly with red in) are more prone, because of the solar radiation warming up a localised area, and more than it would with clear glass. In cool weather and in the absence of the Sun, the outer pane of a double glazed sealed unit, both edge and centre, is relatively cool. When this cool pane is suddenly bathed in sunlight, the temperature of the centre portion of the pane is raised but the edge, being shaded from direct sunlight, experiences a much smaller temperature rise, producing thermal stress. A light coloured indoor curtain or blind, and even more so if very close to the glass restricting airflow, will reflect the sunlight and produce more heat absorption in the outer pane.
The primary cause of an inner pane of a double glazed sealed unit breakage is the same as an outer pane breakage, only the other way round, because of the difference between the indoor-outdoor air temperature acting on the sealed unit, causing more stress on the pane than it's tensile strength can take. Thermal cracking of the inner pane of a double glazed sealed unit is usually associated with a very low outdoor temperature and localised heating on the inside pane. Indoor curtains or blinds should not be fitted indoor side of an under window heating radiator, but rather between the radiator and the window, and with enough clearance at the top and bottom to allow a free air exchange between the room and the space behind the curtain or blind. Maintaining a relatively even room temperature, rather than timed heating cycles where the room (and the inner pane of glass) cools right down, could reduce the risk of breakage due to thermal stress on inner panes.
From this website: http://www.thewindowman.co.uk/explode.htm
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