The 1807 build is practically unusable for me, continuously throwing IncompatibleClassChangeError:
At the same time, the download link for the latest build listed on the "nighties" page (1816) seems not to work.
It seems to link to http://download-ln.jetbrains.com/scala/scala-intellij-bin-0.3.1816.zip, which gives me a 404.
In addition, http://plugins.intellij.net/ seems to be down as well. ;)