My drawing and layers have disappered in version 2.1.3

Hi. I'm brand new to LibreCAD but not to AutoCAD. I know a bit about using cad software but baffled by why my drawing has disappeared. Do I need to get a patch? Is there something I need to setup first before my entries stay put?

So far I'm pleased with LC but not if it's going to continue to ditch my work.

Thanks in advance

your layers might be disabled - a quick check:
goto the widgets menu, dock widgets option and check layer list is ticked.
then goto the layer list dialogue and hit the eye icon to turn on all layers