Hi Daro,
I am not able to think of any other step that you might have to do. But, probably the NWA logs might be giving you something to start your analysis on. Normally, if there is any problem with the view (or it's handler), the nwa logs are pretty explanatory as to the nature of the problem. What I can think of is that you get a blank screen because your error page might not be defined properly. So, it tries to load the error page due to some issue but isn't able to (and thus, the blank screen).
If you have no NWA errors for this, then server restarts or a full redeployment might or might nor fix the issue.
Regards
Pranshu