Ok I have spoken to bbk software and have it from the horses mouth :-)
The currant rc4 update which was due be done when the Harry pt's came out was put on hold due to issues with the F1 timing systems and kers.
Amb have had to filter out magnetic interference caused by the kers system.
This filtering has been added to the rc4 update which will make the Harry pt's about 2.5times more accurate.
The issue with the mrt transponders is becouse when they were made they must be not a perfect clone becouse the rc4 software is filtering out them and causing missed laps at about a rate of 25%
As far as I am aware all rc3 pt's will work perfectly on rc4 and this will inc red hand out transponders.
If anyone needs further info bbk software are more than willing to discuse what's going on as I found our today.
