I also encountered this problem. I came across it in GroupDocs.Viewer version 24.6.0 for .NET Framework 4.6.2. I upgraded to the latest version 24.9.0 and the problem still occurs. On some environments the folder grows h…...The problem occurs only with PDF files. Other file types do not...CustomTempFonts . I am attaching a sample PDF file, which generates 141 folders...