I own Reaper on both PC and Mac.
On the PC when you go into ReaSamplomatic's browser and select some random sample, you can move to the next sample simply by moving cursor keys up / down.
For some reason this feature does not work on a Mac. I just upgraded to ver 5.40 and same issue is present. I use my good ole OS Mavericks since it is lightning fast there. I went into the browser, as shown in the image below, but when i move cursor keys up / down, nothing happens. I can't believe i would have to actually use mouse to select a sample among thousands of them. This can't be real.
Update! solution is here:
https://forum.cockos.com/showthread....75#post1863275