The latest version of Craft (v 1.3.6) has an issue that breaks the main form of linking integration , namely the Hook window in a particular Crafts document. The error message from Craft says “Please try again later”.
Work-arounds:
1.The Hook window works in the All Documents view.
2. You can also use Hook’s search tool to find any Craft document:
url:"craftdocs*"
you can add extra search parameters of course. You can navigate the network of links from the selected Craft bookmark. (The Hook window is a navigator.)
3. You can presumably roll back Craft with Time Machine, though I have not tried that.
Craft have acknowledged and fixed the problem. It will be in the next release ETA Tue. (They update Craft quite frequently.)