linking to the nexus after collecting the first set of green markers fails: the avatar is linked away, the loading screen appears but nothing happens for a few minutes until the following error message appears:
Then the program exits. As it is impossible to get to the GZ antechamber without going through the nexus, this is a dead end. Linking to any other Age is unaffected however. Also, before I started collecting the green markers, I had no trouble linking to the nexus.
Other avatars are also unaffected, but I have not collected markers with them.