Hell, I just upgraded both of my WP sites and both are working fine but one seems to be having errors each time I attempt to export my posts, settings, etc.
The export opens, I select "all" for the series of drop-down filters, and hit "Downlaod Export File." Instead of a "Save to..." prompt, the page turns into a massive page of code and content from my website. No export. The massive body of text is started with four error lines. Here are the errors...
Warning: Illegal offset type in isset or empty in .../wp-includes/taxonomy.php on line 176
Warning: Cannot modify header information - headers already sent by (output started at .../wp-includes/taxonomy.php:176) in .../wp-admin/includes/export.php on line 44
Warning: Cannot modify header information - headers already sent by (output started at .../wp-includes/taxonomy.php:176) in .../wp-admin/includes/export.php on line 45
Warning: Cannot modify header information - headers already sent by (output started at .../wp-includes/taxonomy.php:176) in .../wp-admin/includes/export.php on line 46