Beth, I am remoted into a client RDP server and am not having a problem exporting a Customer List to Excel from preview.
Just to confirm, they are running Sage 100 vs 2014 Advanced 2014 with PU 4. I ran the default customer list by clicking the print button on the bottom right of the customer maintenance screen. I chose the 'Micosoft Excel Workbook Data-Only' option to Application. In the follow on Options dialog, I chose a 'Minimal' format and left everything else as defaulted.
I ran this to disk and to application without any errors. Does that help?