I came across this thread earlier today when looking for an answer to the problem (MC7, Canon Ama plugin installed, no response when trying to ama link to rushes). The discussion has long gone cold, but for anyone coming up against the same problem, the solution I found was this :
When the rushes were copied to hard disk, they were placed in a folder with a date added to the name using “/” characters. Replace the / with something else like “-” and the ama link works fine.