lost project

I recently updated to 2014 (02/12/2013 Monday)
have been working with the project and last saved/sync central yesterday (04/12/2013) at around 4pm
opend the same local file today but unable to find any objects other than spaces.

all linked files show as loaded.

All draughting views are visible including linked CAD files,

previous versions of the file have been restored.

problem does not occur with erlier versions of software or projects last saved in ealrier versions

problem does not occur when opening any of the linked files

has anyone seen anything similar or has any advice

Hi,

I assume you are upgrading from 2013 to 2014.

How did you upgrade the project?

Did you detach it from central first then upgrade and create a new local file or just opened your local file with Revit 2014?