Question:
When I have created a colour overlay and imported these to InterForm400, the PCL-viewer displays black boxes at the positions where the colour elements should be. The spool data I want to re-map are hidden behind these black boxes, which makes it difficult to edit and precisely position the spool data.

Answer:
Please note that the PCL-viewer implemented does not support colours, consequently the colour elements in the PCL-file imported to InterForm400, will be completely black and editing of spool data will be difficult.

Therefore, the required overlay could be imported as both a black-and-white PCL-file and as a colour PCL-file.
Using the black and white PCL-file, will enable viewing of the overlay in the PCL-viewer together with the spool data and re-mapping of the spool data will be as easy as normally.
After final re-mapping and editing of the spool data, the black and white overlay is be replaced by the colour overlay.