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You will find the problem in /var/log/apache most likely. In that directory you will have some error files. Read the errors. It is likely that your form is looking in the wrong spot for the graphics. I haven't played with forms, but when I try to look at your source for the page, it is just a form calling on itself. Not sure about that, but that is well outside my areas of knowledge. In any case, post some of the contents of /var/log/apache/apache-error.log and we can help better.
JimBass - many thanks for your quick reply. There's nothing in the Apache error logs that relates to this problem, suggesting that the process does not even get as far as generating an error. When I looked in the Apache access log I found that the page layout graphics are not even being called by the *GET command. In the apps that work, each page graphic /theme has a *GET command in the access log.
I looked in the source code for my survey page to see what background and other page graphics should be loaded from where, and if I put these file paths in my browser address line directly, they load OK - so it doesn't seem to be a permissions problem - they're just not getting called for display by the initial webpage. I'm still at a loss as to why not.
oh how I hate when things are out of your control! The problem to all this seems to lie in the domain name and is nothing to do with Apache or Linux. I changed the base html path to my IP address in the survey apps ini file so it would be accessed directly on my server (rather than go through dynu.com) and the graphics appear on the page. For some reason the external domain name server I use doesn't allow or get the graphics. Thanks for all your help on this - see you later.