On MacOS, when dragging from a node on an existing card or note, the menu to create a new card or insert an existing note does not work. It just flashes, then disappears and the arrow goes away. It works fine on my iPad.
Obsidian version: 1.7.2 (Catalyst early access)
MacOS: Sequoia (15.0)
The Add card / Add note from vault pop-up seems working on my end.
macOS 14.6.1 / Obsidian v1.7.2
Can you try in the Sandbox vault to rule out any issues specific to that vault?
If it works as expected in the Sandbox or a new text vault, you can go through the troubleshooting steps here: About the Bug reports category - #11 by system to see if it’s a community plugin, theme, or CSS snippet causing the issue.