I created a stack of ~80 images, but cannot seem to view the graph of any pixel history. I loaded the .dim file into the time series tool and selected the bands I wanted use. When I scroll and pick points with the cursor tool nothing shows up in the graph. I also tried to create the graph by selecting pins, but still the graph remained empty. Also, the actual (empty) plot only shows up when I have a band image opened, so maybe I am importing the incorrect file type into the tool? (Re-reporting to notify for bugs in SNAP 8)
I found out that it only works when you import the single products into the tool.