When I entered the WEB module in LR, the old messy unsaved web gallery I had tried to create (my first try at one...) would always reload and pop up, blocking any possible other work on a better webgallery for me. I wanted to start over ... but could do nothing really ... Never got to export anything as i did not want to do export my garbage ...
I finally did understand an earlier comment on another query (similar topic) that suggested one go to the Adobe folder in Applications and delete the subfolder on "web galleries".
This miraculously worked even as my 'unsaved' web gallery never showed up in my Applications/Adobe/webgalleries, not even after re-starts of LR. Miracles happen.
Another work-around I discovered is to make such busted unsaved web galleries "saved" and then delete them inside the Library module of LR where they now appear and can be killed, finally.
Ps: what is SDK?