Sorry to hear you are having problems with your project.
It could be that the project file is corrupt or has become too large or resource heavy for iClone to open and remain stable.
Do you have a backup of the project or an earlier save that you can load to see if the issue is with just with the one save file? You can also try loading one of the sample projects that come with iClone and see if the same issues occur with that. Trial and error is often the best way to narrow down the cause of the problem.
It is also important to remember that project sizes are not infinite and it is important to manage project sizes and complexity to maintain a stable environment inside iClone. Generally it is always better to have two or more small projects making up your scene rather than one super large project. Smaller projects are easier to manage and reduces the chance of issues occurring like you have mentioned.
Peter
Forum Administrator
www.reallusion.com