Problems putting saving images to the remote folder CS5.5

I have been using DW to Get, Edit, and Put files to my Remote files for several years. I recently encountered a problem for which I cannot find an answer. FTP connection seems to be working well. All settings are correct (have not been changed). When I select a file from the
Remote Server the complete file opens and after I complete the editing and seek to put it back to the Remote Server I get an error message saying that I do not have privileges to access the file. I discovered through trial and error that if I do not select the box indicating that I want to include dependent files, all other editing appears in the remote file and shows in the browser. I have multiple images on the website and never have had a problem before. Why would text, formatting, etc. go through but images cannot be uploaded?