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What computer operating system is your Premiere Elements 12 running on? Have you updated 12 to the 12.1 Update using an opened projects Help Menu/Update? If not, please do so.
Are you dealing with strictly a DVD/CD burner as opposed to a Blu-ray DVD/CD burner? If so, then please try the following details to refresh your DVD drivers if you are using a Windows computer. When the burner is installed, have you checked the burner details in the Device Manager/DVD/CD-ROM drives?
If you are working with a Windows computer, please consider refreshing the DVD drivers according to the following Adobe document
CD, DVD drive not recognized after Adobe application install | Windows
Please let us know the outcome.
Thank you.
ATR
Add On...What specific brand/model burner have you used? Do you have Nero burn software installed on your computer with Premiere Elements?