First of all, what you see below is no spam.

After playing around with my friend I happened to enter a lot of ones. But when the text appears on the screen it has some extra info.

I am using 3.8.

EDIT:
There is also a nice lag between pressing enter and the text appearing. I also receive other info like people's chat from the game chat:

..1111111111111SAY 50696;bashitoRRR: how much?

EDIT: (these edits are here because I'm still trying to figure out if this is serious)
If someone's text appears there, it is not in the normal chat box. It also tells me disconnects and other stuff that happens at the same moment.

Use 3.84 beta 5.

Version changed, bug still exists.

Hmm, that sounds like a backdoor also.

At least looks like it...

email [email protected]

I'll first try contacting hampa in the release thread. I found another bug that came with this version (not listed yet).