Only got the 2D selector with ability to move horizontally across the screen, I'd like to move it vertically as well but you gotta use the reference point then which is less accurate.
If you can only move horizontally, but not vertically, it sounds like Modes / Lock Y position
(at least, that's where I find it) has been activated.
Also, if you want to move accurately without using Snaps, try the Delta X/Y
options. If you don't see them in the Inspector Bar, right-click in the Paper Space and select the Selector 2D Properties...
menu item so that you can activate their radio buttons.
TC Pro Platinum 2019, 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1