Try setting the maximum number of characters for the FileMaker fields to 255. 255 is the largest number of characters you can enter into an Access text field.
Thanks so much for that pointer! We change the field options in FMPro to a maximum of 100 characters, and then I relinked to the FMPro database in MS-Access and Access changed the field type to text. So it worked great! Thanks again for your help.