Thank you for adding the nice little convenience of "adding to submenu" when "adding current directory" to the directory hotlist.
Having said so, I am afraid that in the 64-bit version of Total Commander 8.0ß17, this new function Add to submenu has been combined with the undocumented and very surprising feature of truncating the whole directory hotlist right after the added new submenu entry.

How to reproduce:
- Navigate to the folder which you want to add to the directory hotlist.
- Launch the directory hostlist by pressing <ctrl>d. Cf. the unmodified state in this screenshot #1. It just serves to prove that there are 2 submenus and menu items below the 2 submenus.
- Click on "Add current dir". Cf. screenshot #2
- Tick the option "Add to submenu". Cf. screenshot #3
- Select the first available submenu from the offered popup list, i.e. "Current User" in this example. Cf. screenshot #4. Confirm your selection by clicking on [OK].
- Locate the newly added sub-menu item "Saved Games" in the "Current User" sub-menu. Compare the state of the complete directory hotlist to the initial state of the directory hotlist, before we added an item to a sub-menu.
Cf. screenshot #5.
All directory hotlist items, menus and single items, which follow the added new item have disappeared. The directory hotlist has been truncated right after the added new item.
In case you do have a backup of your wincmd.ini compare the backup version to the current version using Total Commander "Compare by content" and you will find that the list has really been truncated.
Windows 7 Home Premium, SP1, 64-bit, and Server 2008 R2
Total Commander 8.0ß17 64-bit
Note:
Following the same steps in Total Commander 8.0ß17 32-bit will add the new item correctly. The original directory hotlist will not be truncated or damaged in any way.
Kind regards,
Karl
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P.S.:
This forum software has got the bad habit of truncating title strings. But you will only notice after you have pushed the post button. This is why the title has been shortened and rephrased.
The orignal title read: TC8.0ß17 x64: "Add to submenu" Truncates Directory Hotlist