We have many extensions installed on our server, including the qlik-multi-kpi extension. We have an issue where, every month or so, any app that uses the qlik-multi-kpi suddenly starts showing "Invalid Visualization. The visulaization was not found on the server. The extension is not available: qlik-multi-kpi". If I go into the QMC's Extensions list, I CAN see the extension is there. If I go to the QlikShare/StaticContent/Extensions folder.. it's there too!
If I delete/reinstall the extension it appears again. Obviously that's an unacceptable solution if it's got to be done monthly. Has anyone else experienced this problem? Our server is on Nov 2018, patch 2, soon to be upgraded, which I know is old, but it seems strange that this problem only affects one extension.
Re: qlik-multi-kpi becomes an Invalid Visualization
When it happens, does it affect all users (and browsers) at the same time? What browser do you use? Could you try with another one?