not come across this before.. when trying to hotload I am getting "not_purged" - what does this mean?

barney_: I would suggest you to restart the application unless you are sure the processes within the modified application are "hotload-friendly".

I mean, some processes do not use a full Mod:Fun(Arg1, ArgN) call while they are in the process loop, so when you hotload the module, you will end-up with partially updated processes.