Using the %base_url% site URL macro question

I am having a bit of trouble using the %base_url% macro in the RW Link.

Setting the RW General settings web address to, on preview, returns the correct site url with a / after it, i.e. the macro is used in a text stack.

I am trying to find the url of images in the the resources folder, which are at However, using the RW Link URL = %base_url%resources/image.jpg doesn’t work and causes an Couldn’t start the internal web server. error in RW.

I am pretty sure that this used to work.

Can anyone explain why this isn’t working as expected?