Clearly state that you are experiencing a loading/crashing issue that appears to be a profile data or desync error.

: Instead of storing every individual crop, animal, and decoration as separate entries in a database, Zynga compresses this data into a "blob". This blob contains your level, progress, farm layout, and inventory. Performance Optimization

Many old forum posts regarding the "user blob" reference Adobe Flash Player settings (Local Storage limits). Because FarmVille 2 has transitioned to HTML5 and WebGL technology, these limits are now governed by your browser's IndexedDB and LocalStorage allocations. Ensure your primary hard drive has at least 10% free space so your browser has room to expand and write these large binary objects. Summary: Keep Your Farm Running Smoothly

If you are trying to restore a "User Blob" (save file):

For mobile users, the process isn't about directly opening a .USERBLOB file. Instead, it involves downloading a pre-modified "save file" from the internet that someone else has created. The general steps are as follows:

In web architecture and gaming, a stands for Binary Large Object . It is a collection of binary data stored as a single entity in a database.