New version 6.37.3, why specify the Dst.address, can not specify dst-port, the option is gray, not available, how do I do port mapping operation? Upgrade 6.38 or so can not operate.

The problem is found, the problem is winbox3.8, winbox3.7 normal.
New version 6.37.3, why specify the Dst.address, can not specify dst-port, the option is gray, not available, how do I do port mapping operation? Upgrade 6.38 or so can not operate.

The problem is found, the problem is winbox3.8, winbox3.7 normal.