Recording disappeared after saving project

I’m using Audacity 2.0.1 and Windows 7 Home Premium.

My recording data disappeared after saving it.
I recorded some audio for about 1h20mins, then saved the project. After the saving was done, the blue waveforms were gone.
I re-opened the .aup file and it opened an empty recording.
I checked the _data folder created and it was empty. I checked the temporary files directory and it was empty too.

This is the first time something like this has happened to me. Usually, Audacity works fine.
Is there any way I can get my recording back?