Here is a temporary work-around to make the thumbnails work again, until the next release of HyperSnap 7 fixes it automatically:
1. Click Windows Start menu, "All Programs", then "Accessories".
2. Right-click "Command Prompt" and choose "Run as Administrator"
3. In the "Administrator: Command Prompt" window, change to the directory where HyperSnap 7 is installed. Most often the command to change there is:
cd "C:\Program Files (x86)\HyperSnap 7"
4. Once there, type another command and press Enter:
regsvr32 x64\ThumbDhs64.dll
5. That's all, close the Command Prompt window and the thumbnails of DHS files should be correct again.
Greg