I found a similar problem, but with commas and backslashes.
It only happens when the spoiler block is at the end of a line.
Adding a non-breaking space isn’t such a good idea after all, as the WordPress visual editor removes it.
I’m getting the same warning about missing argument 2 on line 219, etc.
Yes, thank you, it’s fine now.
I have got this warning too since updating to version 2.7.
Warning: array_intersect_key() [function.array-intersect-key]: Argument #1 is not an array in …/wp-content/plugins/page-links-to/page-links-to.php on line 301
Warning: array_keys() [function.array-keys]: The first argument should be an array in …/wp-content/plugins/page-links-to/page-links-to.php on line 301
