I am using the latest version 2.7 Build 1171 (32-bit, Portable on Win7). In View->Exploere Panel -> View Mode, there are three choices (Details, list and Thumbnail list (Beta)). But Thumbnail list (Beta) is greyed out and I am not able to select. The change log for the new version says thumbnail list mode but am unable to use it. Is there any option in Core settings or Explorer panel settings that I need to turn on?