Did the file migration change the elevation markers to R18? If not you can option click on the R10 elevation markers then open the elevation marker settings, navigate to the R18 one, inject the R10 parameters in to the R18 one in the preview picture, bottom left of the Elevations settings box. You will then have to go through all the settings for that 18 version.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"