Time Line Zoom feature
Using the mouse scroll wheel + Alt on a PC allows you to zoom,
this is a great feature but it seems to be getting worse with recent updates.
When you scroll the mouse wheel the zoom should be directed based on where the courser is on the time line, currently it does something quite random zooming in to a part of the time line which has no relevance to the cursor or even the the play head.
This worked great a few years back but its really not working well in 2018.
Negativity aside, Premiere is great, thanks for all the improvements.
Did you also upgrade to a 4K screen? There seems to be a problem with the scroll zoom feature when Windows is scaled to anything above 100%.