I get usually from most servers of emule the error message: ERROR: Your client is too old, please update it (with latest of mldonkey 2.7.7).
I get this message when connecting to server, when searching (I receive a 900MB file as a search result with this error text as a filename).
I don't know if it is a bug of mldonkey or something else.. If it is not a bug, please close this report and sorry for the inconveniences.
Weird, I am also using MLDonkey 2.7.7 and never saw this server messages.
Are you using the MLDonkey supplied server and IPblock lists? Maybe you
are connected to weird servers.
Maybe, I did not have the bug again, so it maybe this. But I researched the internet and there are ppl having this problem. If it appears to me again, I'll try to reopen or post a new one :)