Sometimes, neotree conks out and stops responding to any commands, such as delete file, open file in horizontal split, and simply open file. Anyone else have ny experience with this? I think it occurs when I try to use neotree and other commands at the same time, such as rgrep.

I can still toggle neotree open/close, but that's about it.

Is there a way to clear the projectile cache?

Never mind, found it! SPC p I!

also, sending the prefix arg before you use SPC p f clears the cache before it searches

so SPC u SPC p f

on that note, does anyone know how to supply an actual prefix argument in spacemacs?

it’s SPC u when in normal mode and C-u in insert or emacs mode

spacemacs seems to convert SPC u to C-u silently, so use SPC u the same way you would C-u in regular emacs