Hi, and thank you both for your reply.😋
Just for your reference:
Firstly emmrecs01, the downloaded test files you reference do indeed open fine but I have to note that they are only 16.6Mb in size. My files are 37.6Mb and have a file extension .RW2 which are in caps, not lower case (...if that should make a difference!). I have tried making a copy and renaming the file extension to lower case but gain the same result - white blank screen with all metadata present. I'll try and see if my camera will allow a smaller raw file to be saved and, if so, I'll report back. 😋
Secondly Murfee, changing the Raw Engine brought no joy for me. But it was useful information regarding the Raw Engine choice. 😋
Many thanks to you both for your kind response. I am very grateful.