KB was the first to be upgraded last night.
All other worlds were upgraded just now.
One of the repeating changes with every recent upgrade is an increase in the number of workers in corporations.
The increase is applied to a small number of corporation types each time and causes an increase in numbers of workers in countries, depending on how many of their corporations now use more workers.
These changes are manageable, require sometimes a reduction in the number of corporations by one and will continue.
Please read about the reasons for this in the game update news on the forum today.