Update text=OK, delete photo=OK, upload photo='Write to file fail

As additional info - the original issue is using the Real Estate demo. I basically let ASPrunner create the demo, uploaded it and ran into the issue. A few minutes ago, I did an identical thing with the Cars demo...basically start a new project, click 'next' at each option, then uploaded it, and everything works fine...database updates, pictures add, delete, upload, OK.
So I guess this is some issue with the actual real estate demo, but I'm pretty clueless as to where to start looking. Are there any files that deal with uploading photos where I could look and compare between the two?
One thing I do see is the cars demo appear to have a complete list of carsadmin_ tables, some of which appear to be linked to other tables. Additionally, when I edit on the cars database the url is /carsadmin_cars_edit.asp whereas on the realestate demo, there are no "admin" tables the editing is under /retblresults_edit.asp (this is logged in as admin in either case)

Thanks to those who took the time to read through the issues I had. I think I've found at least part of the problem. According to my ISP, granting write permission to a folder does not automatically grant write permission to any of the sub-folders...and (at least with this ISP) granting write permission to subfolders is by special request, not something I can control from the administrative panel.
So, one written request later and it seems the photo upload is working