Bard Bug - 0 Length Portals
Using "Magical Journey" in just the wrong spot can cause a portal to be generated that is very hard to click. Portals can be generated that are impossible to click and seem to have 0 length, though this is rare. This is much less apparent to the bard player as he/she learns the optimal places to portal, but it is still possible to do by accident.
A certain minimum length for portals would, i guess, solve this issue.