Oh I see. My apologies. I misunderstood your question.
So your issue only relates to projects previously created with PDR15 where you'd applied CDR adjustments. Is that correct? If so,, that certainly is a strange problem!
You open a PDR15 project in PDR16 with clips adjusted in CDR5 & the adjusted clips no longer show the adjustments?
If you send one of those clips to CDR, the adjustments are shown correctly? but when you go back to PDR16, they don't?
Could you post some screenshots to illustrate?
If you still have PDR15, you may need to use it for thosse projects. If not, you may need to produce the adjuted clips in CDR5 then import them back to your project.
I'll refer this issue to the team at CL, once I have some more specific data to share.
PIX
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