Update 1.9.9 has been released, containing a few bugfixes:
Added a workaround for issues YoYoGames is refusing to fix in GM:Studio. Instance sync and some other functions now work once again in the Dll version.
The previous update introduced a new movement algorithm, which turned out to not work quite as well as intended. The algorithm has been reverted for the All-version, but the Dll-version has received a brand-new movement alorithm, which works much better than any prevous algorithm, especially in high-latency situations.
Possibly fixed an issue where some variables would not be sent to the server.