There is an important bug in FileMaker Pro 13 which becomes manifest if one tries to import a very large number of records into a file while the the option "preserve external container storage" is enabled. When these specifications are met, the import will slow to a halt and stop.
At this time, the only workaround is to break the import process into increments that contain a small number of records. Depending upon how one distributes their solution to one's clients, this may not be an option for many.
Again, this problem only occurs if one is importing a very large number of records and the option "preserve external container storage" is enabled.
Developers should be aware of this problem. Hopefully file FMI fix it soon.
ComChart Medical Software