My ISP recently upgraded from 4.0.3pl1 to 4.0.6 - i have a script that runs an 'array_unique' on a 2d array.  This used to work previously, but now it reduces the array down to a single item.

Here is the section of script:
// CLEAN UP DUPLICATES THAT DON'T HAVE THE DESCRIPTION, BUT ARE THE SAME SECTION
				if ( $debug ) echo "<P style='text-align:left'><B>CLEAN UP DUPLICATE SECTIONS</B><BR>
														<I>[\$idx,\$count]...</I><BR>";
				$count = 0;
				for ( $idx = 0; $idx < count($section_result); ++$idx ) {
					$comp1 = strtolower($section_result[$idx][0]);
					$comp2 = strtolower($section_result[$idx+1][0]);
					$comp3 = strtolower($section_result[$idx-1][0]);

					if ( $comp1 == $comp2 ) {
					// IF THIS ENTRY IS THE SAME SECTION AS THE NEXT ONE
						if ( $section_result[$idx+1][1] != '' ) {
							$section[$count][0] = $section_result[$idx+1][0];
							$section[$count][1] = $section_result[$idx+1][1];
							++$count;
						} elseif ( $section_result[$idx][1] != '' ) {
							$section[$count][0] = $section_result[$idx][0];
							$section[$count][1] = $section_result[$idx][1];
							++$count;
						}
					} elseif ( $comp1 != $comp3 ) {
						$section[$count][0] = $section_result[$idx][0];
						$section[$count][1] = $section_result[$idx][1];
						++$count;
					}
					if ( $debug ) echo "[$idx,$count] " . $section[$count-1][0] . " -- " . $section[$count-1][1] . "<BR>";
				} // close for

				if ( $debug ) echo "</P>";

				$section = array_unique($section);

				if ( $debug ) {
					echo "<P style='text-align:left'><B>UNIQUE SECTIONS AFTER CLEAN-UP</B><BR>";
					echo "section count: " . count($section) . " | $count<BR>";
					echo "<I>Work it thru a 'for' loop:</I><BR>";
					for ( $idx = 0; $idx < $count; ++$idx ) {
						echo $section[$idx][0] . " -- " . $section[$idx][1] . "<BR>";
					}
					echo "<I>Work it thru a 'foreach' loop:</I><BR>";
					foreach ( $section as $message ) {
						echo $message[0] . " -- " . $message[1] . "<BR>";
					}
					echo "</P>";
					echo "<P style='text-align:left'><B>UNIQUE SECTION_RESULT AFTER CLEAN-UP</B><BR>";
					foreach ( $section_result as $message ) {
						echo $message[0] . " -- " . $message[1] . "<BR>";
					}
					echo "</P>";
				}