Hello Anthony V., There is a known issue where the preview of a line will not show up until you finish drawing the line. If this is not the issue you are referencing, please carefully work through these steps of our guide to Solving Technical Issues : 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. Step 3: Clear your cache If none of the above succeeds, please thoroughly work through all of the requested information in Step 4 . (Don't forget the complete Console Log!) Thank you!