Depth sorting issue in GL2PS exports of vtkTextActor3D backgrounds.
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
The background is z-fighting with the text, and sometimes it loses:
https://open.cdash.org/testDetails.php?test=313123118&build=3708836
There is a mechanism to specify an offset position for the text background during the export, but it looks like it's not being used at the moment.