netCut is running fine in clean windows 10 and window 7 SP1 with latest security pack . so at the moment unless we have a way to reproduce it. we will not be able to do any “fix”. please provide how to reproduce the problem.
Other than that , possible problem related to your system network could be and fix are.
1. try to reconnect your WIFI, make sure your WIFI TCP/IP is using DHCP automatic obtain IP. if it is fixed IP, make sure the Fix IP is there that is not blank. (some user report this and be able fix the problem after reconnect to WIFI
2. remove /disable google chrome ext that may interface with netCut.