This build is a quick fix to solve some issues introduced by the new parameter dialog features in r128, mainly that the Function object's 'Call' action crashed, and annoying autocompleting in strings. If you haven't downloaded r128 yet, check the r128 changelog here to read about the new syntax highlighting features and other changes.
Please remember problems like this are to be expected with beta releases - if you'd prefer not to deal with things going wrong, stick to the stable releases. On the other hand, we do appreciate help with testing beta updates!