Error on using Tools-Export

Since uprgading to WP3, I get the following error when attempting to use the Export function to backup my blogs. This is consistent across all of my blogs regardless of theme.

Not sure how to resolve this, and didn’t see it in a topic search.
Thanks
David

Warning: Illegal offset type in isset or empty in /mnt/w0222/d22/s09/b02fe7cc/www/7questionsconsulting.com/wp-includes/taxonomy.php on line 176

Warning: Cannot modify header information – headers already sent by (output started at /mnt/w0222/d22/s09/b02fe7cc/www/7questionsconsulting.com/wp-includes/taxonomy.php:176) in /mnt/w0222/d22/s09/b02fe7cc/www/7questionsconsulting.com/wp-admin/includes/export.php on line 44

Warning: Cannot modify header information – headers already sent by (output started at /mnt/w0222/d22/s09/b02fe7cc/www/7questionsconsulting.com/wp-includes/taxonomy.php:176) in /mnt/w0222/d22/s09/b02fe7cc/www/7questionsconsulting.com/wp-admin/includes/export.php on line 45

Warning: Cannot modify header information – headers already sent by (output started at /mnt/w0222/d22/s09/b02fe7cc/www/7questionsconsulting.com/wp-includes/taxonomy.php:176) in /mnt/w0222/d22/s09/b02fe7cc/www/7questionsconsulting.com/wp-admin/includes/export.php on line 46
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