We have seen several reports where customers were getting the issue where plotting to PDF created black boxes covering the text. These boxes were showing randomly and on different spots. To visualize it better please see this picture:
When deleting this label and printing it again another black box would show up. For this issue we found a workaround you may use in the meantime
1. Go to Plot dialog
2. Click on PDF Options. This option will only show up for PDF.
3. Under “Font Handling” uncheck “Capture fonts used in the drawing” and check “Convert all text to geometry
4. Click OK
Note: In the "Changes to a Printer Configuration File" either save this PC3 (recommended) or use it for the current plot only. If you chose to use it only for this plot then you would have to do this every time you plot.