Win10 64 bit; Third Gen i7 CPU; ATI HD7xxx GPU; 24 gigs RAM
Broken: Hash f70b548
Short description of error
The display percentage parameter breaks for object particles with children when a render is finished (ie. if you only have 10 percent displayed beforehand, it goes to 100 percent afterward).
Exact steps for others to reproduce the error
Open the .blend file and you'll see a few particles, now render. When the render is done, press esc to go back to the 3D view and notice all of the particles are now visible.
This only happens when the particles have children (as a similar issue was fixed for particles with no children).