<2013 IS A FILE FORMAT RELEASE>
This news needs to be spread around more. Every 4th release historically has been a file format release and 2013 is no different. That means that 2010 was a file format release. And 2011 and 2012 were on the 2010 file format. 2011 and 2012 are backwards compatible with 2010. You can save and open between any of those 3 releases, since they are on the same format. 2013 is the start of a new format. Files saved in 2013 and then saved back to an earlier format cannot be edited in the prior format. They become proxy objects. You can Export to AutoCAD and then edit them as Core AutoCAD objects in an earlier release.
Joshua Benoist, PE
Senior Support Specialist
I have "messed" up my catalogs in the past and had to copy the catalog from a new installation. You will of course have to regen the catalog to add any new parts that might have been created after the initial installation on the original machine. This would be a last resort in my opinion but it definately works. Just copy your original catalog to a safe place so you can copy over any custom fittings if need be.
This error message is because any MvPart built using 2012 or 2013 Content builder adds an IFCTC key to the .xml file for that part. The 2010 and 2011 see this and throw the error because it doesnt know what that is. If you get your apc file back up and running and are able to regenerate your catalogs, you can run that catalog check and find the parts with the problem or if you can remember which ones you might have opened/edited/created in 2012, then just go those parts, open the .xml files, remove the IFCTC key and save the .xml.
I build all my MvParts using 2011 so that this IFCTC line is not created and they work in all versions. This prevents the guys using 2011 and 2010 from receiving that error when i send them Equipment.