Hi RMcD. I changed the spelling in the title as you wanted. I watched your video and it appears you are selecting the green door line, several times around the 0:40 mark in your video. What if you Zoom in more on your map and do the same as you were doing there to select it? I think if you are more zoomed-in it might be easier to consistently drag across just-the-door. I believe there are some other tips (or possibly workarounds) about selecting doors in dynamic lighting. Hopefully some other users will come along to offer some techniques, or you may want to search Roll20 forums for threads about selecting doors in dynamic lighting. I see that you reported you've already tested it without extensions. Following are the usual troubleshooting instructions for your review. As you already accomplished some of the steps, if you would like to continue testing to see if there is a bug, please advance to the Console Log step 4 and provide that log. Troubleshooting steps: Can you please follow Steps 1-3 of our Solving Technical Issues wiki page, taking special care to temporarily disable all browser add-ons and extensions, temporarily pause your anti-virus, and try switching browsers (for Chrome/Firefox specific issues) to see if one of those components is causing the problem. If all of that fails, please follow Step 4 , including providing all of the necessary information, so that we can further assist you. Wiki Docs on Dynamic lighting, <a href="https://wiki.roll20.net/Dynamic_Lighting" rel="nofollow">https://wiki.roll20.net/Dynamic_Lighting</a>