Php Memory Error Persistent

We have a user that was trying to import around 2000 pages via xml. As expected they experienced a php memory area after 100 or so pages were uploaded, which wasn't bad, I thought they would get the error after 50 or so pages based on my past experience with large xml imports into WP. We have 64 mb php memory set as default and this works well as this user is not an atypical user.

This occurred a day ago, but the user still gets the memory error when they attempt to view all of their existing pages via dashboard > Pages > edit. This activity shouldn't be memory intensive so it is almost as though the memory error is being saved in cache somewhere. We have restarted apache, mysql and deleted the cache from Super Cache.

Anyone have any ideas on any solutions to fix the memory error? Any feedback appreciated.