On your Save or Refresh button, have an action to "Post Value", so that even after refresh you have that on clipboard

"Post Value" is an option to avoid such scenarios. But, the problem with this is, if your screen contains too many fields, then it will affect the system's performance.

I have faced the same issue (multi-node system). In my case, it was happening sporadically. So, we check each node's configuration and found that there was some mismatch. After correcting those settings, now it's not happening.   

are we expecting parameter page to be persisted? If yes, I believe it may not be restored…

i am setting a parameter in the DT to show some buttons in my section , but after the DT parametes are getting vanished - how to use it?

Hi,

Thanks for answering. Yes I am expecting that my parameter page will be persist after refreshing. 

If I add "Post Value" then I get error " java.lang.NullPointerException" , I think it is because my section does not contain any controls - only readonly value from DataPage [Section.Param]