All my cr2, nef and tiff files import fine into Lightroom 4. All the jpegs made in DxO import fine into Lighroom. But the jpegs made in Digital Pro Professional aren't recognized in my Library folders. Neither are the jpegs made with in my camera along with the raw files. If I open a tiff file in Capture NX2 to do local dodging and burning it saves it fine within Lightroom and saves those jpegs too.
PS: Using Windows 7x64 home premium, Canon 5D Mk2
Strange? Possibly not.....if the option to "Treat JPEG files next to raw files as separate photos" is unchecked in your Lightroom Preferences (General Tab) then Lightroom will only allow the importation of the Raw of a Raw+Jpeg 'pair' (the jpeg is noted and referenced as a 'sidecar' file in the Raw's metadata). That would easily explain the issue of the OOC raw+jpeg pairs, and may explain the issue of the DPP jpegs IF they have the same filename and live in the same folder as their original raw files.