we get a lot Notice message and blank screen in admin pages on many update functionality (see attached)

Hi Chab,

You can find the solution in HERE or search it on joomla forum :)

Warm Regards,

David

I made change in
./libraries/cms/application/cms.php

the line number in the latest version is 960

diff between old an new

936c936
< $type = 'message';
---
> $type = null;

thanks for your support.