Ohhh so history and clipboard sharing are off by default (in windows 10?)  its been so long, and its never caused any issue (though ive used synergy and mwb for years and their "sharing" is much more rudimentary than multiplicities) that i forgot i had enabled it manually - assumed it was that way by default. 

either way, day 2 now - zero crashes on any machine with history & sharing off. 

and please dont thank me.  as big of an arsehole as ive been - i dont deserve it.  I just want to resolve it at this point so anything i can do within reason.

the wake on lan thing might be all thats left on the table

This is very interesting and would explain why the issue doesn't show for most users.

My suspicion is it would be something to do with the sync happening on both.  I would recommend against this feature though as multiplicity defers sending clipboard data between machines until something asks for it and that feature could force instant requests and thus pointless copying especially with file data.

We will investigate further.

Thanks, klepp0906 for the tip!

Oddly enough I've not encountered the issue this week at all (and I have been using MP between systems a lot).  Once it resurfaces I'll disable the clipboard sharing and see if that does the trick.

Thanks again!

On the secondary, yes, enabled..  The option is not there on my primary.   So when I test this, it will be to turn it off on the secondary system.

Really hoping that does the trick.  You saw it so often that we should be fairly certain if it does not return for you in a day or so.   Keeping fingers crossed!