In this post, in the second image down, there was no device in the list. You sure that was the same on his PC? Cause if Windows doesn’t show it there, but Sonar sees it, that’s unusual… IE theoretically impossible, because that window gets the list by using the same MMAPI call as sonar…
I thnk TK has since retracted that 
well those are took on my comp. As I said it doesn’t work for now on my comp. We had not the time to get printscreens on my friend’s comp because he had a severe bug that has corrupted his windows and his motherboard has memory read errors (not the memory itself, but slots !) and we unable to precess more test with his computer (that have Sonar, Professionnal audio soundcard etc.) at the same time we were testing… That’s an illusrated example of the Murphy Law !!!
As long we cannot test, it cannot go further. My friend will probably need to get a new comp (or at least new MB and maybe other parts…). So by the time if anyone would have get more info ?
By the time, I have contacted Microship to get some help here is their response :
-
Once when you receive the PIC’s you can find out the revision of the PIC Devices.
-
Please note that you will receive the samples as per the lot available with Microchip.
-
As per the revision you have the errata which gives a work around for the EUSART.
-
If you have received Rev A3 then issue has the workaround is as follows:
Module: EUSART
When performing back-to-back transmission in 9-bit mode (TX9D bit in the TXSTA register is
set), an ongoing transmission’s timing can be corrupted if the TX9D bit (for the next transmission)
is not written immediately following the setting of TXIF. This is because any write to the
TXSTA register results in a reset of the Baud Rate Generator which will effect any ongoing
transmission.
Work around
Load TX9D just after TXIF is set, either by polling TXIF or by writing TX9D at the beginning of the Interrupt Service Routine, or only write to TX9D when a transmission is not in progress
(TRMT = 1).
Date Codes that pertain to this issue: All engineering and production devices.
For further information please refer to the weblink given below:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1999&ty=&dty=§ion=&NextRow=&ssUserText=PIC18F2455
Hope this helps
Revert back in case of further queries.
Best Regards
If you click on the weblink, you can see that is seems to be an version B4 of the pic and in the errata, there is nothing about the EUSTART bug so it MAY work for the second part… as long the first (detection) is solved…