System Information
Operating system: win10
Graphics card: gtx1080

Blender Version
2.80b, be91d4ef957, blender2.8, 2018-12-04

Short description of error
changing between hair and emitter particle system, changing back to emitter shows nothing

Exact steps for others to reproduce the error
open blender
add particle system to default cube
playback -OK
change to hair - OK
change back to emitter - nothing, only adding a new psystem reinits it