Rename display bug exists in 7zFMn 4.15b running on WinXP SP1
To see it:
1. Open a folder with several subfolders (say A, B, C)
2. Set sort order to name (Ctrl-F3)
3. Use F2 to rename one of the subfolders in such a way that its position in the sort order changes (for example, rename A to F)
4. At this time there will be two subfolders shown with the new name (F, B, F in the example); The names become correct upon refresh (Ctrl-R) but one should really not need to refresh to get correct names.
I've fixed it. Thanks!