Please don't hesitate to send an email to digthatlick (at) hfm-weimar.de in case the pattern search application is behaving in unexpected ways, e.g. displaying error messages or not responding anymore.
Our ISMIR 2018 paper Two web applications for exploring melodic patterns in jazz solos also provides some hints for how to use the search interface.
Finally, we would greatly appreciate letting us know about any ideas for improving the search interface, documentation, etc.
Dig-That-Lick Team, Weimar