ahoibrowser

I used an old version and it works fine. I actually had the same problem with an older update of WP-SEO on a different site. If you have a backup somewhere you’ll be fine.

Yeah, you’re right riesiko, it’s the WP-SEO plugin who is causing the problem. I turned it off and polylang works just fine.
Thanks a lot, great find!

If I try with 1.6.3 I get the following error messages:

Notice: Trying to get property of non-object in (…)/wp-content/plugins/polylang/include/plugins-compat.php on line 85

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in (…)/wp-content/plugins/polylang/include/plugins-compat.php on line 85

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in (…)/wp-content/plugins/polylang/include/plugins-compat.php on line 85

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in (…)/wp-content/plugins/polylang/include/plugins-compat.php on line 85

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in (…)/wp-content/plugins/polylang/include/plugins-compat.php on line 85

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in (…)/wp-content/plugins/polylang/include/plugins-compat.php on line 85

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in (…)/wp-content/plugins/polylang/include/plugins-compat.php on line 85

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in (…)/wp-content/plugins/polylang/include/plugins-compat.php on line 85

Warning: Cannot modify header information – headers already sent by (output started at (…)/wp-content/plugins/polylang/include/plugins-compat.php:85) in (…)/wp-includes/pluggable.php on line 1178

@tony: Are you able to get back to the old version? Because I find it very upsetting that even the fall back is not working. Do you have a solution?

Ok, great, so I am not the only one with this kind of problem.