As we upgrade from 2013 SP3 to SP5, the SP5 users are seeing errors in models & drawings which weren't there in SP3.
Also using EPDM.
All machines are reasonable to good spec and all approved hardware and drivers.
More on this. It looks like the errors being displayed where previously there weren't any are related to 'mates on axes'.
Suppress those mates and unsuppress them OR try force rebuild to see if the error goes off . If not then please report to your VAR.
Retrieving data ...