After check many thread in the forum and try many times, i found the solution to solve the WebGui not reponding problem. I don't know if my solution can help your problem, but you can try:
1, Microsoft internet explore and EDGE can not be used, firefox and chrome can be used to disply the WEBGUI.
2, port 8088 can not be used in my computer, but you can change to other port, for example 8089,9083 etc. you can change it in autoexec.cfg
webgui_port = 8089
Good Luck!