Hi SIERRA TEC,
By going to github I found a dashboard plugin and vflibs version for Moodle 3.5 and I am having the same problems with it. I can get an SQL that works, but provides no visible results. For instance, trying one of the examples in the documentation in regards to users, my SQL process 44 records...but when I look at the results, even in a spreadsheet, there is no data there.