I have both InDesign CS5 (7.0.4) and CS6 (8.0.1) running on a MacPro1,1 with Mac OS 10.6.8
I am unable to link two separate text threads together. If I use the in or out ports and thread to an empty, unthreaded text box, everything is fine, but as soon as I try to link any two boxes that have text in them, a new text box is created and the text threads to that instead of threading the two existing text boxes. In a related vein, if I try to unlink two threaded boxes by double-clicking either the in or out port between them, I instead get a new text box threaded to the port I double-clicked. I can auto-flow a new text document just fine with all pages threaded. I have no idea what's going on, but since much of my work is book layout, this is a big problem for me. Anyone see this before and have any solutions? This is occuring in both versions of ID mentioned above.