Hi Rob,
Thanks for the reply. DPP has been officially released but I am still confused by the fact that LR 5.4 jpegs can be read by DPP 4.0 but LR5.5 cannot. I will escalate DPP but on my Windows 7 machine DPP 3.x will not open LR jpegs but will open LR 5.4, curious. I guess given that both DPP and LR 5.5 were released at almost the same time there will be banter back and forth as to who is responsible. One point I should make is that when jpegs exported from LR5.5 are opened in another application and saved again DPP will open them. I often take a 1000 or more images at a time for clients and don't want to have to re-do completed tasks.
Regards,
Steve.