Lost link to the project I was working on

I was working on a Netsys project (gas) for a few days without any problem. However, the other day I can't access it anymore. First of all I was asked to log in and once logged in, I can't access the projects. I can see them on the project explorer (windows path/file) and click the project folder but the 'tick' mark to open the project is grayed out. Anyone else had similar issues?