Hevacomp Netsys

Recently created a Netsys project for duct calculations. Have come to re-open the project but when it comes to opening it up on the project explorer screen, the green tick that comes up that you click to re-enter the project comes up for half a second and vanishes so I am currently unable to re-open the file. The design database at the side has all the info such as no of rooms, date last used etc. & nothing has been touched in terms of the folders within our system. Is there a way to enter the project again?

Thanks

Josh