Hello,
I am using EM Server version: 5.9.7.8.
I will explain you in detail in which case the filter is working, and in which case it's not working.
I have two files .dset.
One contains all our EM Desktop logs, the second contains the same logs, but only the errors.
When I open them, I would like to filter on the date.
So I add a filter on the date, search for the date I want, and then I apply the filter.
This works for my second dataset, with errors only.
For my first dataset, the "apply" button in the filter doesn't appear.
The only difference between the two datasets is : there is a graph in the first.
This is the first dataset, when I select the date in the filter, I can't see the "apply" button, the data below are not filtered, and you can see the graph on the right.
Notice that I have just selected the date in the filter :
This is the second, where you can see the button "apply" in the filter, after the selection in the field :
Please make the "apply" button reappear 
Thank you !