After selecting all files/folders and using the shell-extension (isoshell) "Add to iso-file" or "add to xxx.iso" the structure of the new iso-images looks like this:
- folder1file1 - folder1file2
Other files and directories are still missing.
Another bug: When you only select files in windows explorer (no directories) you don't find the UltraISO-item as shell-extension in contextmenu.