It's not a bug in the code.
I haven't been able to speak to the tester since, but he did tell me that he could see the background picture, just none of the text that gets added over the top. Skidracer has suggested I try a couple of meta tags to ensure that the page is not being cached, so I will try that when I next speak to the tester who's having the problem.
I haven't been able to speak to the tester since, but he did tell me that he could see the background picture, just none of the text that gets added over the top. Skidracer has suggested I try a couple of meta tags to ensure that the page is not being cached, so I will try that when I next speak to the tester who's having the problem.