Just a thought - are you people having problems uploading to "railforums.co.uk" or "www.railforums.co.uk"
I know the www. on this site can make a difference. I uploaded to the www. version and had no problems.
For the record, I also used Chrome on Windows XP (but to be honest, I don't think it will have made much difference what is used)
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Don't know if relevant I use windows 7 with ie8 browser. My photo was within the parameter rules size wise- not sure if this has an effect on upload capabilities.
I've sometimes had issues before with that, but mine this time, whilst of a relatively small file size, was over the guideline dimensions, and it was fine