A few days ago I installed fresh 3CX (3CXPhoneSystem31.exe) on the x64 computer. And I got the bug. Links "Add PSTN" and "Add VOIP" were accessible but dysfunctional (web-console hung). I thought it was x64-related bug. But I have another instance on another computer. It was installed from the 3cxphonesystem3.exe package and PSTN gateway was created successfully. Then I upgraded by the 3CXPhoneSystem31.exe package. Server status indicated 3.0.2328.0 after upgrade. I have deleted PSTN gateway, tried to create a new gateway, and got the same bug. If I click "Add PSTN" or "Add VOIP" then the console hangs.