We are sorry to hear that you have such issue. Unfortunately from your post is not clear how to reproduce the issue. Since that could you please share with us file example which doesn’t displayed and code examples from the next files:
1. Globals.asax.cs
2. Viewer widget code from .aspx web page
3. beck-end code example of this aspx web page - aspx.cs file
Also will be helpful if you will share with us screenshot of the issue.
Thank you for the example. Yes, we have reproduced the issue. We created a bug ticket report and our product team will resolve it soon. After resolving we will notify you.