If you mean the lastest stable version is 'Old Builds', okay,
Let's repro in 170910 alpha.
Start CMD Task in ConEmu
Run bash.exe -> Terminal Mode = XA OK
Exit bash, return to CMD
Run WSL.exe (or Ubuntu.exe, if WSL has been installed from WinStore) -> Termin Mode = W Bug
Run cmd.exe in bash.exe in cmd.exe, press any function key (backspace or arrow), booooooooom XD
Switch Terminal Mode from XAC to W, press any function key, nothing happend XD
Good news, this bug will be fixed in next Insider Preview.
bash.exe -> catched
wsl.exe -> catched
Ubuntu.exe -> not catched (Think not possible to fix)
One more thing:
If WSL is not installed by legacy way but from Windows Store, the Ubuntu icon is located in
Different distros in different path.