Currently the "Log in with Google" button redirects you to a "Page not found." Our forum vendors have implemented a fix, and now we are just waiting on a patch to be released. In the meantime, while on the "Page not found" you can edit the URL to delete the second gatk, firecloud, or wdl (depending on what subforum you are acessing).
If I understand correctly, call-caching works by copying the files from a previous workflow provided that the script, input are the exact same. But since WDL is copying file it is taking up too much disk space. Is there a way to make it do hard or soft linking instead?