I am having the exact same issue. I am running 9.6. I just posted on my issue and then came across your post. I tried all the things you did as the documentation suggests. It didn't resolve the issue. I worked with a contractor from Aspire on our upgrade to 9.6 and he did all of the original dashboards. This is the first time I made an edit to a dashboard and found it didn't integrate to the Web View UI. I've reached out to my contractor hoping he has some insight and wanted to reach out to the community as well.