Major bug in new version

There is a major bug in the new update of this app. When you work on a long document, the line bounces around, making it tough to work with. Ive tried to contact support on this, and they asked a few follow up questions, but theyve gone silent. Needless to say, I would never consider paying for the new version until this is addressed.

jake_lex about iA Writer Classic (Legacy Support Edition), v2.1.5