I use parallels. It has been for some time that the scrolling has not been adjustable in parallels. Logos ignores the settings. In Beta 2 or 3 I noticed that the scrolling had increased greatly in speed. If I wasn't careful I would fly by several chapters. Beta 4 is out now and I decided to go modify my settings again. Single line scrolling is now working. I can't say if this was a problem outside of parallels. But it is definitely no longer a problem.
