I have experienced the same problems as others report.
I have seen the Pironman5 RGB fans not illuminate nor spin in the standard configuration.
I posted a new finding at the following link.
I do so because I suspected I could overcome the issue by using a common ground between the Pironman5 IO board and the RGB fans.
I post this reply for completeness and reference.
I have not attempted any software-based suggestion to resolve the fan issue.
I would be very interested from anyone in the community regarding this finding.