When using HD Flexo Screens within Nexus, the following error appears in the Rasterise Separations module:
"Undefined - Failed to load CSB tile header".
The error "Undefined - Failed to load CSB tile header" appears in the Rasterise Separations module.
Try making a new shortcut to the bg_data_screen_v010 folder and rename it Esko Screening and place within Nexus Version Folder. Or if there is already an existing Esko screening folder, copy the contents of the bg_data_screens into the existing folder.
If this still does not work, regenerate the HD Flexo Screens and redo the previous steps.