Can someone give me pointer. I upgraded to v.2015 about 30 days ago. I am working on a multi-story apartment buiding with standard units and elevator cores xref'd in to each floors building plan. I sent the drawings over to a consultant for them to start work. I got a responce that they need me to convert them down to v.2010 for them to use them. I have done this 100's of time over the past 20 year for consultants. I save all xrefs and building plans in a seperat folder (twice as a matter of fact) as well as the building floor level plans but I keep getting an error saying
"This drawing contains custom object that are not suppoerted in previuos versions"
95% of this project was created using v.2010 prior to upgrading. The only changes I have made with v. 2015 are some grid lines and moving some units (xrefs) around a little. Further more all of the block in the unit plans were created between 1995-2000 so there are no new elements in the plans. Further more there is no way to find out if what "custom object" are cuasing the problem
This seems very stupid that Autodesk is preventing me from comunicating with other consultants.
Any one know how to fix this or a work around. The effecency and time saving advantages of using AutoDesk Products are taking a very seriuos hit whith this problem.