Blank icons

[dangeliandrea@gmail.com]

Salutations. I can no longer see thumbnails in icons. A file icon appears blank.

[Reymund Oyong]

Greetings @dangeliandrea@gmail.com

Thank you for reaching out to us through our Community Forums!

Please provide the following details so we could help investigate and troubleshoot this issue:

1. The version and complete build of your Nitro PDF Pro installation. This information can be found under the Help tab > About Nitro Pro (example: Nitro Pro 13.x.x.x). 
2. A screenshot showing blank icons. 

Kind regards,

[dangeliandrea@gmail.com]

Salutations.
Below is the information requested:
1) Nitro Pro 13.33.2.645;
2) https://www.dropbox.com/s/lph7u1l9rtwfcgq/Blank icons.jpg?dl=0