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I do know now not to turn off particles/ Hair. I think this is when things went wrong, when I turned them off.
I'm sorry to hear of your problems with Flocking Hans.
This will be little consolation after spending the time reconstructing your project but I offer it here as I don't want you (or anyone else) to have false expectations of turning Hair On/Off. That will lead you to more (and unnecessary) frustration somewhere down the line. A new user reading 'Keep Particles turned on' is going to accept that as gospel and I want to assure you its not.
There is no known instance where turning particles/hair on or off breaks flocking that I know of.
Nothing in A:M reports is listed either. While a new bug may have surfaced... don't see it.
Something else happened or went wrong.
For the record though: Flocking requires Particles to be turned on or it won't work.
Depending on how you are using A:M you may need to set Particles on in several places to properly render.
One thing to do first before troubleshooting too far is to consider closing down A:M and restarting your computer.
When programs remain on for extended periods of time things can go wrong.
Consider for instance updates that have been downloaded and installed but not completely installed.
Often the installation is not fully finished until the computer is restarted.
Flocking has its own set of criteria too that must be met and wherever a step is missed or something is not set appropriately flocking will not appear to work at all. The trick is to determine (hopefully sooner than later) whether what is being experienced is a bug... a missed step... unknown requirement that hasn't been met... or user error. I believe we make a serious mistake when we automatically assume something that is not working is a bug. In some cases the process may not be optimal but where not followed expected outcomes can result.
Just in testing Flocking several times yesterday I had to remind myself of the requirements for successful flocking. Turning Particles on is only one. It was only after seeing they weren't working that I started to remember what they were.
Why type all of this... I don't want you to think you need to keep Particles on all the time.
That would be a very bad thing as Particles eats up a lot of processing power in realtime.
Turn Particles Off when you don't need them.
Turn them on if you do.
Before rebuilding projects post information on it here. Before making big changes save often and incrementally under different file names.
If there is a bug somewhere in the mix we'll help Hash Inc squash that too.