After updating to Plesk Obsidian 18.0.47 on Linux, blank page is shown instead of WP Toolkit menu

Alexander Davydov

Updated January 13, 2026 19:08

kb: bug kb: fixed Plesk for Linux ext: wptk

Applicable to:

After updating Plesk on Linux server to Obsidian 18.0.47, the menu WordPress shows blank page instead of the WP Toolkit interface.
One of the following non-English locales - Greek (el-GR), Hebrew (he-IL), Russian (ru-RU), Ukrainian (uk-UA), Thai (th-TH) (and possibly Arabic (ar)) - is set as the default locale in Tools & Settings > Languages.

Product issue:

#PPPM-13735 "WP Toolkit now works correctly with all locales."
Fixed in:
- Plesk Obsidian 29 September 2022

Please consider updating your server:

If update is not possible for some reason you may try the following

workaround

Until the bug is fixed, use the workaround:

Connect to the server using SSH.
Back up the file /usr/local/psa/admin/conf/php.ini:

# cp -ap /usr/local/psa/admin/conf/php.ini{,.backup}
Open the file /usr/local/psa/admin/conf/php.ini in the text editor and add the following line to it:

pcre.backtrack_limit = 10000000
Restart the service sw-engine:

# service sw-engine restart