After restarting the switch, the start configuration is always loaded. If none is available, the default configuration will be loaded and the switch starts in its factory state.
If no communication is possible in the VLAN 1 on a certain switch port, go to the menu VLAN Management → Private VLAN and make sure, that all ports are a member of the Private VLAN 1. When a Private VLAN has been created, a switch port must be a member of the respective VLAN as well as the corresponding Private VLAN for the communication to be possible. In the default configuration all switch ports are a member of the Private VLAN 1. Therefore only the VLAN 1 is affected unless additional Private VLANs are added.