Is that update mandatory ?
its not mandatory as in its a hardfork or anything but it includes all of the latest GETH commits. 130 of them to be exact.
"This release fixes an issue where some clients could get stuck during a chain reorganisation and can happen at random. Without this fix you'd need to restart your client.
We haven't received any reports of this actually happening but noticed that one of our own (very long) running nodes got stuck."-- Jeff Wilcke
I've updated to the latest version and lot of old "missing" transactions got re-sent even though I've re-sent them manually already.
So quite a few of you guys got paid double, keep it, I'm just glad I kept the hotwallet balance low so the most of the double/triple payments actually failed because the wallet was depleted.
ETH is really "different".. Why would it resend transactions which went missing days ago.. Sheesh...
Everything is fixed now, I've purged the TX database.