This BUG affects all CORE themes apart from Standard (Legacy)
while using windows and ie7 on RTL languages (like Hebrew and Arabic)
both right and left blocks aren't appearing at all...
other problems extend to the Login page, where the middle part of the page appears blank, whilst the header and footer are visible, including performance info as seen in Moodle Q&A Test site when viewing Standard theme in IE8 in IE7 Compatibility Mode.