Yes, did work!
It was a response of javascript code, that happen in some linux server.
I don’t know the exact reason for this error… =(
Try set
chmod 777
in your thumbnails directory.
Otherwise, try to use this another plugin:
http://ww.wp.xz.cn/extend/plugins/regenerate-thumbnails/
Thanks for quick answer.
The described problem appeared only on my Windows development-server.
Edit: I finally tracked it down, there was a PHP warning of another plugin, because of define('WP_DEBUG', true); in wp-config.php and because of this the POST to /wp-admin/admin-ajax.php got the PHP warning as result which of course is no valid JSON…
On my production servers with no warnings enabled all works fine.
I have a blog with this plugin running on Windows + Apache =/
Tracked down the problem, see also edited post above, here the response of the ajax-call, the regeneration worked, only the display of result-message gets messed up because of malformed JSON (Notices caused by another plugin):
<br />
<b>Notice</b>: some php warning text... in <b>C:\some path\web\wp-includes\functions.php</b> on line <b>2839</b><br />
<br />
<b>Notice</b>: some php warning text... in <b>C:\some path\web\wp-includes\functions.php</b> on line <b>2839</b><br />
{"success":"<b>Some image name (ID 2085): All thumbnails was successfully regenerated in 2,013 seconds.<\/b>"}
Thank you Ov3rfly. =)
I get it!
I will fix it at next version plugin.
For now, disconsider this message.