Softaculous Team has launched 5.6.7 in the Stable branch.
Following is the list of changes :
1) [Bug Fix] : In Plesk, some servers not having system PHP binary /usr/bin/php faced a blank page issue while accessing Softaculous due to a change in Softaculous 5.6.6 released yesterday. This is fixed now.
If you are unable to upgrade Softaculous or still face the blank page issue please contact us via support ticket here.
The Softaculous Team