DDS image is 'garbled' in PSPX6

I have put the correct Nvidia dds plugin files in both 32 and 64bit versions of Corel PSPX6, but when I open a DDS image it is ‘garbled’? An example 512x512 texture file, part of the image is missing, and the rest is repeated 4 times vertically. I am aware of the mip maps, and these are not loaded. I have tried earlier versions of dds.8bi and dds64.8bi but have the same problem. However, I do have a DDS viewer, and image shows correctly, also the Win10 File Explorer thumbnails show correctly. Before a Win10 reset, PSPX6 DID load the DDS file correctly? Any help, PLEASE.