Issues modifying icons after accessing the icon changers on recycle bin, email checker or clock. Maybe any modules.

Steps to recreate:

Launch Nexus Ultimate
Right click a Sub-Dock parent (not an item in the sub-dock)
Choose Dock Entry Properties
Click Change Icon
The Change Icon dialog is normal. Ready to choose an icon.

Right click the Clock item, Email Checker or Recycle Bin item
Choose Dock Entry Properties
Cancel and close that property dialog (don't even need to access its icons)
Right click a Sub-Dock parent (not an item in the sub-dock)
Choose Dock Entry Properties
Click Change Icon
The Change Icon dialog still pointing at the clock. Even if it was the Recycle Bin that was opened before. If the icon is changed in this dialog, it changes the icons for the clock. Even though I opened the properties of a Sub-Dock.

Work Around:

After experiencing this issue, the only way to fix it is to EXIT Nexus Ultimate and restart it, or...

Right click any normal Link item
Choose Dock Entry Properties
Cancel and close that property dialog (don't even need to access its icons)
Right click a Sub-Dock parent (not an item in the sub-dock)
Choose Dock Entry Properties
Click Change Icon
The Change Icon dialog is back to normal. Ready to choose an icon.

Fixed for next release, thank you.

Until then, as a work-around you can simply drag & drop an ICO, PNG or TIF file straight into the sub-dock place holder icon to change it (you can do this with every other dock item too, in fact, it's the fastest way to change an icon).

That's cool. Thanx for the great tip.