we have just deployed the latest upstream version of copr-frontend to fix an issue with invalid quoting of baseurl for an additional repo if it contained '$' symbol. You may check the logs for errors if you use an additonal repos feature.
We have also built the latest upstream copr-rpmbuild version to fix building in custom chroots, to fix https://bugzilla.redhat.com/show_bug.cgi?id=1461875
and also to experimentally employ spectool for downloading external sources identified by Source directive in .spec file. Note that you need network enabled for this feature to work.
This is mainly a "hotfix" release.