I have been experiencing exactly the same issue as described above.
Enscape 2,8 for revit was working fine up until yesterday afternoon.
This morning when trying to rendeer a model in enscape 2.8 for sketchup it loads succesfully and shows the enscape tab in the task bar but it is minimized and does not want to open or maximize. When hovering over the tab it shows a "preview" of a blank white screen.
Futhermore I have updated my Nvidia graphics card driver and uninstalled enscape and reinstalled an older version (enscape 2.7) and it does exactly the same thing.
What is the progress on resolving this issue as it appears a number of users are struggling with this?
Thank you in advance.