Hi Erel, this is the point, nothing happens. I can create a new project, but when I try to save nothing happens, even when I try to close the B4A and the it asks for save the project. The same behaviour happens when I tried to open an existing project with B4A open.
This last operation it's just possible open directly the file from the filesystem.
There were other reports of this issue. It seems like a .Net bug that prevents the native file dialog from showing. Several members were able to solve it by installing the latest .Net Framework and updating Windows to the latest service pack available.