Hello Tim,
Many thanks,
The below the plugin being immediatelly deatctivating when I in to Plugin section of admin bar…:
The plugin admin-bar-disabler/admin-bar-disabler.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin autoptimize/autoptimize.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin basic-user-avatars/init.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin baw-login-logout-menu/bawllm.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin bbpress-private-replies/bbp-private-replies.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin bbpress/bbpress.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin image-upload-for-bbpress/bbp-image-upload.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin imagify/imagify.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin s2member/s2member.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin sidebar-login/sidebar-login.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin updraftplus/updraftplus.php has been deactivated due to an error: The plugin does not have a valid header.
The plugin wp-optimize/wp-optimize.php has been deactivated due to an error: The plugin does not have a valid header.
May be you know which one is causing problem?