Thank you for that, but, alas, that does not appear to be the problem as I can no longer upload images that I have sucessfully uploaded previously.

CHG CANON: Thanks again for your suggestion but I have just compared file sizes and the images in the albums I already have on Facebook exceed those I have attempted to put on since November. In one instance I unsucessfully attempted to upload three images which already formed part of one of my existing Facebook albums! As mentioned before, I even deleted a number of albums.

Thanks a lot. What I don't understand, however, is if it is the image size, why was I able to upload images up until November. I will check out the link you have kindly provided.

Thank you for the suggestion. Do you know what the implications are though. Would I lose everything I currently have on Facebook - friends, for instance; or would I still maintain everything once I reboot (for want of a better term)?

Thank you for you promt reply but it isn't that. I even deleted a few albums but it made no difference.

Hi Chums, I have been viewing this forum for a few weeks now and finally decided to register. I joined the digital photography age in July 2015. I will now outline the cameras and lenses I use as they are pertinent to the problem I have with Facebook:

Canon 7D mark 11
Canon 70D
Canon 300mm f2.8 IS USM
Canon 100mm - 400 f4.5-5.6 IS mark 11 USM.

I use the above for wildlife photography, shoot RAW and process using the latest incarnation of Canon DPP 4. Until November 2015 I had absolutely no problems/issues with creating an album on Facebook from the JPEGs created from the above. That all came to a sudden end in November when the images would not upload and I was left with a blank square with the word 'oops' in the middle. Occasionally, one or two images would upload from a batch of say 12. There was never any logic as to which ones would upload. So far, no one has been able to offer an explanation. Any takers on this forum? Thank you in anticipation.