By default the light_ciew is the camera. Under normal circumstances you should leave it the way it is, except for the following cases:

- If you're using a custom view to render your level you should set light_view to that view.
- If you're using multiple views you should set light_view to NULL, effectively switching clipping of lights of.

I don't know if it's Lite-C only feature, the manual does not state that. If you can, switch to lite-c. Flickering lights however do no propose that lightview is set incorrectly. Have you checked max_lights? Are you using level blocks and if so is the map compiled with the "Create Meshes" option?