In addition to the patch, you need to check the box in the Import Wizard that says "Include history" or something similiar when you select what to import.
We have verified that this does work when the patch is applied and the box is checked. The Crystal patch versioning/distribution structure is different from other products, and the "latest" patches is a confusing term. Each component is patched separately, and there are often patch dependencies and hotfixes that have not yet been rolled into patches, or sometimes included in weekly, but not monthly patch releases.
You should verify via patch readmes that you have the patch that addresses this specific issue, and contact Crystal support if your problem continues.
-Tim