The filter module didn't work sometimes

[Yestin]

I don't know whether it's a bug, or I do the wrong operation.

When I want to filter the node after loading a graph with 2000 nodes. The context window shows I have 1% visible, but the graph window still have all the nodes visible. The "Select" button can set the visible nodes selected, but the "Filter" button don't set the invisible nodes invisible.
The problem occurs randomly. I think it might because the graph window didn't repaint in time, or repaint with wrong parameters.

BTW, how can I filter nodes which have the attribute "Not Equal" to a certain String? use "equal" regex?