I've spent a couple of hours on it now and finally managed to figure out how to fix it
You'll either need adb or a simple file manager with a text editor. But before you do that kill Google Earth through Manage Applications or using a task manager. Once that's done either pull or edit /data/data/com.google.earth/drivers.ini.
When you've done that add the following to the end of the file before the ending bracket (so within SETTINGS).
DiskCache/cacheSize = 2000 DiskCache/minCacheSize = 0 DiskCache/cacheSizeOnDiskInMB = 2000
Now simply push the file or save if you're using a file manager.
Good luck, and let me know if you run into any problems!