Hi Tim,
Thanks for working with Data Illustrator. I hope I can help you figure this out or fix the potential bug in question.
First off, a little troubleshooting, are you using the direct selection tool to click on the single anchor point?
This is the direct selection tool:
Also, did you Repeat the line by company and then Partition each line by the Row Id? These two operations are needed to create a line for each company with the anchor points representing each data case for that company.
Thanks,
John