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If you get such an error, there is something wrong in the project. Something could not be read or was missing, etc... A detailed description can be found in the console log. Maybe you could send it to us via email? The loss of identity is by intention. If you weren't forced to explicitly save your project you might completely ignore the fact that an error occurred.
We know this is still sub-optimal. Data security and backup improvements are in the number 1 position of the things to improve for version 2.1. Amongst these things is an automatic backup creation as soon an error occurs, a mode detailed graphical description of what could not be loaded, etc...
Lucky you - but we'll still improve on it ;)