Terry, please provide details of the crash. Does the program stop with an error message or does it never complete the task (eg preview).

From what version did you upgrade?

If you have not done so already, please go to step 5 export project to create an iwzip (reliable backup). In an ideal world you would have created an iwzip in the last version of your project that was stable.

Please make sure there are no empty cells on any pages. If you have an empty cell or row add an object to it (eg text), there is no need to add content.

If your project becomes stable and you can reliably do a preview, do a full refresh preview (ctrl+preview) and then when uploading to the web select full upload (not new and changed).

Hello. Also temporarily try to disable your antivirus and firewall.
Try to run the program as administrator.