Yep, it's almost everywhere. Seems that the backoffice skin wasn't updated with the 2.1 Skins version yet.

I get related errors from skins created for v2.0, so might be related or something.

I'm thinking not upgrading for production use for now.

I'm seeing this also, for the first time. The "notices" are lik this:

Notice: Undefined variable: template in /public_html/blogs/inc/_core/ui/forms/_form.class.php on line 198

Notice: Undefined property: formstart in /public_html/blogs/inc/_core/ui/forms/_form.class.php on line 1304

Notice: Undefined property: no_title_fmt in /public_html/blogs/inc/_core/ui/forms/_form.class.php on line 1308

Notice: Undefined property: fieldstart in /public_html/blogs/inc/_core/ui/forms/_form.class.php on line 391

Notice: Undefined property: labelstart in /public_html/blogs/inc/_core/ui/forms/_form.class.php on line 2650

Notice: Undefined property: labelend in /public_html/blogs/inc/_core/ui/forms/_form.class.php on line 2661

Maybe a partial solution... I found these errors come whenever $Results->filter_area is set.

In line 875 of inc/_core/ui/results/_results.class.php you find the following:

$this->Form = new Form( regenerate_url( $ignore ), $this->param_prefix.'form_search', 'post', 'blockspan' ); // COPY!!

But, the thing is, 'blockspan' is not a valid option for the Form constructor.

So I changed the said line to

$this->Form = new Form( regenerate_url( $ignore ), $this->param_prefix.'form_search', 'post', NULL); // COPY!!

And it worked. Now the forms where you can toggle filters won't give the annoying warnings, but they look a little bit ugly, which probably can be fixed tweaking the CSS files, something I'll leave to a more enterprising soul.

Austriaco wrote:

And it worked. Now the forms where you can toggle filters won't give the annoying warnings, but they look a little bit ugly, which probably can be fixed tweaking the CSS files, something I'll leave to a more enterprising soul.

Perfect! I don't see anything ugly about the forms... :roll:
Any comments on this from developers, apart from the cryptic sticky? :)

The cryptic sticky is in fact about the solution. Just be patient and wait for 2.2 to come out.

Good luck