Mask Bug

[michelvictor]

Here's what's happening: the white lines are grouped with the head, and the head itself is the mask with the "Extrude Strokes" effect applied. For some reason, the white lines aren't showing up in certain parts of the head. When I preview the render, everything looks normal, but it's really difficult to work on the project without being able to see the white lines while editing.
When I turn off the "Extrude Strokes" effect, all the lines become visible, but the overall result gets a bit messy.
Editor Screen:

Preview Render:


Edit: Okay, I figured out what's happening. Some lines with "dirt" on the face are on the same layer as the head, and that's causing the issue. Is there any way to prevent this? Maybe by making the editor more efficient, like utilizing more of my graphics card to render everything correctly?