This is a WebGL issue that your browser is running into. When your client loads a new page, all the graphics are processed first and then the dynamic lighting is drawn afterwards. Typically this is suppose to process so quickly, that the human eye never has the chance to the graphics load on the page before the dynamic lighting is already in place. What you're running into is either your browser having an issue with WebGL, a third party browser extension is running in the background and slowing down this process, or it's an internet speed or computer RAM issue. If you're still seeing issues after following these steps: Step 1: Make sure to use the right browser Please check if these issues persist when using both Chrome and Firefox. Step 2: Ensure that there are no extensions/addons interfering with Roll20 Please disable all add-ons/extensions and anti-virus programs. Step 3: Clear your cache Then I would recommend a workaround where your GM enables Fog of War on the page until your browser has successfully drawn the dynamic lighting over the Page. Then when that's done, the GM can disable Fog of War or use it in combination with DL to ensure you can't see the play areas you're not suppose to yet.