QlikView AccessPoint Thumbnails: No Preview Available, Thumbnail missing or not refreshing
Document thumbnails on the QlikView AccessPoint are either missing/blank or showing No Preview Available.
The thumbnails on the QlikView AccessPoint are not refreshing after being updated.
QlikView Server, all versions
This issue can have multiple root causes.
Saved in WebView mode
The QlikView document may have been saved in WebView mode. In this case, the .qvw will not display a thumbnail on the AccessPoint and always show No Preview Available.
To solve: Ensure "Web View" is not active in the document and resave it.
To turn off WebView go to Viewin the toolbar and toggle Turn on/off WebView
The wrong sheet is selected for thumbnail creation
Verify that the correct sheet is used for creating the thumbnail.
To solve: Open the document and verify the setting.
To do so, go to:
Ensure Document Thumbnail is set to "Opening Sheet"
QlikView Server cached the wrong data
QlikView may have the wrong data for the thumbnail cached.
To solve: Restart the QlikView Server service. This will clear the cached data or configure how frequently the thumbnail cache is being updated.
PLEASE NOTE: The refresh interval only applies to a situation where the Thumbnail should be updated following a reload in the desktop client in graphical mode. Reloads done via the QlikView Distribution Service or via batch will not update the thumbnail. This is a known limitation.
To change the setting:
1.Stop the QlikView Server Service 2.Edit the settin.inifile located in “C:\ProgramData\QlikTech\QlikViewServer” 3.Add “QvThumbnailCacheUpdateInterval=X” inside the[Settings 7]section of the file, whereXequals the custom number in minutes
NOTE: The setting.ini must have an empty line at the end, in order for settings to apply.
4.Save the file and start the QlikView Server Service 5. Restart the QlikView WebServer service, or if using IIS, perform an IISRESETfrom a CMD prompt
Manually force a refresh of the Thumbnail
If the above fail, 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.
This situation may occur if there were changes to the thumbnail configuration in specific documents prior to being published. Configuration is under QlikView Desktop > Settings > Document Properties > Opening > Document Thumbnail. 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.