edit schematic annotation will freeze the whole cadence session until I xkill it

I am using Cadence Virtuoso IC6.1.7-64b.500.21 with ADE-L.

I find it in multiple cases that when I open view->annotations->Setup and try to add more DC Operating Points, the whole cadence session will be freezon. I come back the next morning, it is still hanging there. I have to kill it. Is this a bug?