In pipeline configuration option:
 
This project is parameterized: Global Variable String Parameter can't be set. It is saying 
Global Variable  does not exist - eventhouht I can select it from drop down and confirmed that it exists

Second issue:
It is not saving Build periodically option any longer: H/60 * * * *
Actually I can save it but, when i open for edit again - it is not showing and build it not triggered automatically as it used to be before upgrade. I can't downgrade back, as seems like configuration cannot be restored or recreated again
 
After saving everything is blank. No option can be saved