It is no mRemoteNG Bug but integrated Putty 0.63 has this Bugs:
These features are new in beta 0.64 (released 2015-02-28):
Security fix: PuTTY no longer retains the private half of users' keys in memory by mistake after authenticating with them. See private-key-not-wiped-2. (Sorry! We thought we'd fixed that in 0.63, but missed one.)
Support for SSH connection sharing, so that multiple instances of PuTTY to the same host can share a single SSH connection instead of all having to log in independently.
Command-line and configuration option to specify the expected host key(s).
Defaults change: PuTTY now defaults to SSH-2 only, instead of its previous default of SSH-2 preferred.
Local socket errors in port-forwarded connections are now recorded in the PuTTY Event Log.
Bug fix: repeat key exchanges in the middle of an SSH session now never cause an annoying interactive host key prompt.
Bug fix: reset the bolded-text default setting back to what it used to be. (0.63 set it to something wrong, as a side effect of refactoring.)
Bug fix: IPv6 literals are handled sensibly throughout the suite, if you enclose them in square brackets to prevent the colons being mistaken for a ort suffix.
Bug fix: IPv6 dynamic port forwardings should work again.
Windows Server 2008 R2 Enterprise Service Pack 1 64bit
Resolved in commit: cdb2c0690cb3ecf05279f1834bf47da7f576a9dc