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I have the same problem on a Multisite-Network-Installation when EWWW Image Optimizer Plugin is enabled. Dev of EWWW wrote the following on a similar thread (related to OTF Regenerate Thumbnail, which seems to cause the same conflict):

Indeed it does seems to loop for quite a while, and the reason is that OTF is generating fresh thumbnails for all the images in the media library when you view it… the result is that EWWW also optimizes those images when they are generated.
I don’t think OTF used to do that in the Media Library, but it does now. The grid view will also load eventually, just like the list, but it takes longer, because there are generally more images being viewed in grid view. Not sure there is anything I can do on my end to prevent that, a simple check for is_admin() in OTF would probably take care of things.

It would be great if Regenerate Thumbnails could add the simple is_admin() check

+1

I can confirm this. It would be great if OTF Regenerate Thumbnails could add the simple is_admin() check

Since the last update this plugin broke compatibility with WPMU Multisite Privacy Plugin. When you choose “Anyone that visits must first provide this password” in WPMU Multisite Privacy Plugin it redirects to the normal WP login page instead of showing the page.

[ Redacted, please do not post passwords into posts ]

I also wrote this at WPMU Dev forums: Domain Mapping – https://premium.wpmudev.org/forums/topic/multisite-privacy-plugin-password-protectin-not-working-anymore#post-786047

They had a dimilar bug in their own Domain Mapping Plugin causing redirect loop in sub-site’s login when original admin/login pages are forced to have https and subdomain has mapped domain. It seems they have fixed this issue in version 4.2.0.5. It seems they are willing to share their fix.

Btw: Great to hear that Domain Mapping will find it’s way into core! Thanks so much for this plugin Ron Rennick!

Can anyone help me to enhance the above script by a funtion two add choose a custom class for the submenu and adding a <span></span> to each ul of a given submenu. Actually i’m using this function

class UL_Class_Walker extends Walker_Nav_Menu {
  function start_lvl(&$output, $depth) {
    $indent = str_repeat("\t", $depth);
    $output .= "\n$indent<ul class=\"sub-menu level-".$depth."\"><span></span>\n";
  }
}

which works pretty well, but i don’t know how to combine it with the function in this thread.

Thanks in advance!

For everyone who is also looking for a solution.
I figured out that there is no simple way without a plugin.

Here is a very simple and well working solution:
Plugin Fold Page List