Problems uploading simple information

This is not a ProductCart v4 problem. The code was identical in previous versions. That line in the file reads:

f.Delete

This means the FileSystemObject is unable to delete the "shipFromSettings.asp" file that is already there before recreating it with the new shipping settings.

This is indeed a folder permission issue. It means that "DELETE" permissions are not available on the "includes".

Since you indicated that you have been using ProductCart for years, there are two possibilities that would explain a folder permissions issue that you did not have before:

(1) This is a new Web server (or a new location on the same Web server)
(2) The Web hosting company - for some reason - reset the folder permissions (we've seen this happen in very rare cases).

In any case, the solution is to reapply folder permissions. Remember that this cannot be done through FTP on a Windows server (unlike a Unix server), but rather has to be done through your Web hosting administration area (or directly on the server if this is a dedicated server).

For details, please see http://wiki.earlyimpact.com/productcart/install-permissions