Not to be funny, but I looked through your profile and you have reported an issue once in this topic and once on a previous topic. On both topic @lubos said that the issue is a program installed on your computer that is conflicting with Manager. I cannot see how that is the fault of the developer - if you are a serious business do you not have an IT technician looking after your computers when something goes wrong. It may not be a VPN program - it could be any software - its impossible to state without someone looking at your computer.
As an IT technician, my best advice is to backup your data - wipe windows and re-install windows Microsoft Office and windows updates. Then install Manager and see if it works. If it does, keep installing all your software, rebooting after each install and test Manager until you find the culprit. You may never find the culprit as I have quite a few times my clients had issues that required a complete re-install of windows and their problem (whatever it was) never came back even with the exact same software installed. Windows unfortunately does sometimes require a complete re-install if you cannot get any given program to work because of some issue caused by an old program that was not deleted properly or something. This problem is not exclusive to Manager. I have re-installed windows when Internet Explorer wouldn’t work and nothing I tried fixed it.
I have only been with manager for about 4 months, but I have been with it long enough to say that I never want to leave. Its your choice to use another product, but I personally think you are being unfair as you have only reported the issue twice and on both occasions you were told that another program is conflicting with manager. As a business you should have an IT technician to help you with these things and your technicians answer should be - spend maximum an hour trying to get the program to work with existing install - failing that re-intall windows.
One thing that you could try is run windows msconfig and load diagnostic startup - which runs only essential services. This will disable startup programs etc - you could try eliminate it that way.
The problem is something installed on your computer or windows is a bit borked - i.e. not Manager’s fault.