QlikView - Thumbnail appear and disappear on browser refreshArticle Number: 000049769 | Last Modified: 2019/10/10
Sometimes you will see the Thumbnail completely blank, sometimes you will get "No Preview Available" and sometimes the thumbnail appears as expected.
- QlikView Server, all versions
QlikView Server may still be in the process of caching some thumbnails information or has not yet reached the thumbnails caching system routine which may have been interrupted by external factors.
In QlikView 12.10 SR6 and newer versions there is a setting to set the cache timeout. This may workaround issues where the refresh of the thumbnails may have gotten interrupted and left incomplete for external reasons. Please see QlikView - Document thumbnail not refreshing in Access Point
Otherwise, a restart of the QlikView Server service should trigger a reinitialize the thumbnails cache.
If this fails, try toggling the setting under QlikView Desktop > Settings > Document Properties > Opening > Document Thumbnail, to "None". Then reload the app, and change the setting back to "Opening sheet", and reload the app.
Configuration info is found under Document Properties - Opening - Document Thumbnail
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