Some image formats are not supported by all browsers.
For reference to image formats and the browsers that support them:
https://en.wikipedia.org/wiki/Comparison_of_web_browsers#cite_note-TIFF-220
To display all images you can:
1) Set driver options to return specific image formats.
Not all scanners support different image formats.
For all driver options available for a scanner using Ranger version 4 and up, see the driver options INI file located at:
C:\ProgramData\Silver Bullet Technology\Ranger\Scanner Plug-ins\[Scanner Name]
For all driver options available for a scanner using Ranger version 2, see the INI file located at:
C:\ProgramData\Silver Bullet Technology\Ranger\[Scanner Name]
2) Convert all images returned to the app from Ranger to a supported image type.
Note: If you are using a SmartSource scanner and your grayscale JPEG formatted images
are still not displaying, it is likely that you are configured to receive TIFF wrapped JPEG (the default).
See:
Why are my grayscale images JPEG wrapped in a TIFF header?
http://www.sbulletsupport.com/forum/index.php?topic=307.0