I have several handouts containing macros that send text to the chat window. Last night, when using one of these the macro failed: instead of sending text to the chat window like this: it instead popped up this window: Which, when I clicking "Continue" sent me to a new browser window displaying a "Page Not Found" error. We continued play with me just verbally describing what the link was supposed to display, so game play wasn't really effected. Later, when I went back to analyse what went wrong, I see that the link definition in the handout had been changed to this: <a href="https://app.roll20.net/editor/%60/emas%20A%20cloud%20of%20fine%20brown%20powder%20sprays%20from%20around%20the%20lock.%20Everyone%20within%205%20ft.%20must%20make%20a%20DC%2013%20Constitution%20saving%20throw%20or%20take%20[[3d6]]%20Poison%20damage.%20If%20the%20saving%20throw%20is%20failed,%20then%20that%20person%20or%20creature%20must%20make%20another%20DC%2013%20Constitution%20saving%20throw%20each%20round%20or%20take%20an%20additional%201d6%20poison%20damage.%20The%20effect%20ends%20after%20the%20person%20or%20creature%20makes%20three%20successful%20saving%20throws" rel="nofollow">https://app.roll20.net/editor/%60/emas%20A%20cloud%20of%20fine%20brown%20powder%20sprays%20from%20around%20the%20lock.%20Everyone%20within%205%20ft.%20must%20make%20a%20DC%2013%20Constitution%20saving%20throw%20or%20take%20[[3d6]]%20Poison%20damage.%20If%20the%20saving%20throw%20is%20failed,%20then%20that%20person%20or%20creature%20must%20make%20another%20DC%2013%20Constitution%20saving%20throw%20each%20round%20or%20take%20an%20additional%201d6%20poison%20damage.%20The%20effect%20ends%20after%20the%20person%20or%20creature%20makes%20three%20successful%20saving%20throws</a>. Instead of this, as I originally wrote it: `/emas A cloud of fine brown powder sprays from around the lock. Everyone within 5 ft. must make a DC 13 Constitution saving throw or take [[3d6]] Poison damage. If the saving throw is failed, then that person or creature must make another DC 13 Constitution saving throw eac round or take an additional 1d6 poison damage. The effect ends after the person or creature makes three successful saving throws. What caused the link definition to change?