Again, I do not have this issue.
If I go to the following link in my local installation.. it works:
http://localhost/feng220/index.php?c=task&a=view&id=652The only thing it may have changed from the 1.X to the 2.X is that the ids have been changed and they are not the same as the ones they were in Feng 1.X.
Lets say a task had the id of 500... now in Feng 2 it may be 2403.
Is this the problem you are experiencing?
If so, I am afraid nothing can be done right now, but for you looking into your database for further information about the previous tasks (or whatever) and find out which one is it in the 2.X version.
Best regards,
Francisco