Save and Open buttons do not work

When I try to save a model in Aris Express, the save as does not do anything. Also the Open option is not working at all. I don't get an error message, it just doesn't react to the action.

This happened to me before and I unistalled and installed ARIS and it started working, however I wouldn't like to keep uninstalling and installing over and over again.

If someone dealt with this issue before, could you please help?

Thanks in advance.

Sandra