Hi - I could really use some insights on this situation that has just occurred to me. I have just re-published all my website files and the attached GIF
is what I see when I visit my site at https://www.mirboonorthmarket.com. Is this a RapidWeaver issue? I have RW Classic 9.3.4 build 21106. I desperately need this fixed as this market is scheduled shortly. The changes I made were to change text in some paragraphs, and I definitely did not remove any stacks! 
Hi @dougparke
It seems that the basic stack of Source is not present on the pages hence the misinterpretation of the code. This stack (Source Base Stack) is with those of Source Project (in the navigation window of the Stacks), it is necessary to add one to each page.
In order not to have to modify page by page, it is usual to make a Partial and to add this partial on each page. Hope that helps.
Hi @Bruno , thanks for the advice - the issue I had was that I was unable to update RW pages because the crap that was all over my website was also all over my editor inside RW. It actually eventually fixed itself after about 5 restarts of my machine. I did not have to add back anything. Does not leave me with a great deal of confidence I have to say.