I have had a repeating (but occasional)  problem with dynamic hair that I make where some hairs fly off in a sort of ascending scatter of individual hairs (or hair guides) from one of several hair groups only. The first time this happened I located the group and deleted it - then rebuilt the group - and no fly off. It has just happened again with a new hair composition and seems to be from the same place - right rear on the wig base.

Anyone seen this or have suggestions? The weird thing is it seems to be from the same area in a dynamic hair construct.

is this when you simulate the hair, or when you are actually building the groups, maybe a screenshot of the hair group zone settings would help?

It's actually not visible when I have finished building the hair groups - it only appears at render. This screenshot captures the render and the hair flyoff. I will reply with another screenshot showing settings.

are you turning the hair into a conforming figure?, i'm trying to work out the relationship of the joint editor settings to a parented skull cap, i'm no expert btw, but i have used the hair room to make dynamic hairs more than a few times......

No the joint editor is only open to occasionaly zero all when I start acloth sim - just happens to be open. Only dynamic hair here.

what is the gravity setting for the fly away hair group?, or you could post the hair prop and i will see if i get the same effects when it renders?, you can sitemail me for my email address if you wish

I've had this happen before. I reported it to Sm as a possible bug. Was told it was and I quote "Some news. It looks like at least part of the issue has to do with your extremely high hair density setting of 115k, whereas hair density is normally only supposed to be at 25k. It's like trying to cram 115 people into a room that only fits 25 people - things will start to overflow, which looks like exactly what you're encountering. Dial down your hair density settings to 25k and you'll likely not encounter this again.

If you're wanting a fuller look, then there are various tricks you can use in the settings to achieve that effect without increasing hair density to such high numbers (for example, there is a setting to make the hair root thicker, and part of the purpose of a skull cap is so you can change the color of that skull cap to match the hair color)."

I've yet to find a way to fix it except deleting the group and starting over. 

Red phantom. Sound right. I raise hair density rather high - but deleting the groups doesn't seem to fix the flyoff issue. I'll work on lowerind hair density today and let you know.

It won't fix the problem, only, supposedly, avoid it in the future. I say supposedly because I just received this advice and haven't had a chance to put it to the test.

OK update. I reduced all the hair counts on this hair and rendered - still the flyoff. Then I deleted the groups one by one as it isn't obvious which group is the offender. Once identified I deleted only that group from a new file and it went away. I will experiment more. But it's not clear what made the group that caused/was the flyoff. Too high hair count? I also tried calcualting the dynamics with collisons on of all the hair groups and then rendering but the flyoff was still there. So nothing to do with dynamics.

The best way I found to find those fly offs is either by:

1 hiding all hair groups except 1 and rendering it. If they don't show, then repeat with the next group.

or

2 in the hair room one by one check the show populated box. They will show up with that.

Then you only have to delete the one group. 

Hum - you are much more reductive than me a process oriented child of pre script thinking. 

I put back the group or simulation thereof in the hair where the deleted group had been and then rendered - no problem. All high hair counts were there from previous problem render/sim. So now I will try doing a pose/cloth simullation - which is where I think the flyoff problem arose last time. Not sure but wil report in when I have a couple of hours to do this. Debugging this really cuts down on artist output. I suspect some kind of memory leak between hair cloth simulations.