Had both running, no problems but I'v just transferred all my P5 stuff into the P6 runtime because I got fed up swapping between the 2 runtimes!! If you do that you only need to copy over the "library", "textures", "geometries" and "reflection maps". You can then effectively get rid of P5 if you want but I keep it there as backup due to the still unpredictability of P6.

Injustice will be avenged.
Cofiwch Dryweryn.