If the annotation and its label are out of the viewport (the plot area) and then use the PanZoomBar to scroll to it, the label is not displayed. It appears after the chart layout is updated (ex: resize or zoom).
Hi, On 22 October 2018 (Monday), we are uploading our next LIB version (2018.3.1022) where the fix will be included. It will also be included in our official version – R1 2019, scheduled for the mid of January 2019. Best regards, Ralitsa Kumanova