I am using regular Dyanmic Lighting, which I have frequently used in this campaign without issue. In my latest map that I am adding, some of the line-of-sight regions are glitching. Any help would be appreciated! Troubleshooting notes: The problem occurs when logged in as a player viewing from a player token. The problem occurs in both Firefox and Chrome. The problem does *not* occur when selecting the token as GM and using CTRL-L to view as player. The problem persists after browser shutdowns and a computer restart overnight. Deleting and redrawing the offending polylines does not work - the redrawn lines glitch in a similar way. Sometimes other polylines such as the pillars were also giving glitched views. However, the last time I deleted and redrew the eastern wall, the pillars suddenly started working properly. Dynamic lighting settings: Enabled, Enforce Line of Sight, Only Update on Drop, Global Illumination, Restrict Movement are all true. Fog of War/Advanced Fog of War are false. The wall is correctly blocking movement - the token cannot move to the south through the wall, even though it can see. The token is set to 60/0, Has Sight. The lighting is working properly if I switch over to Updated Dynamic Lighting. However, that mode doesn't yet seem to have the "only update on drop" option, so that's not a viable solution yet. This is what the view should look like (as seen by the GM using CTRL-L) This is what the player sees. They can see some areas that should be restricted, and they can even see onto the far side of some walls it is recognizing. Here are the polylines I have established: