I've had problems with library parts as projects were migrated through several iterations of archicad. Parts that went from 11 to 12 were fine but those same parts converting from 12 to 13 did not.
e.g. Chair 01 11 converted to Chair 01 12 but not to Chair 01 13.
GS said that the parts can't always make that second conversion. To solve this,
- I alt/option clicked on the missing object dot,
- used Find & Select to select all same objects,
- opened the library object settings and located the comparable 13 object,
- injected the parameters into the preview picture in the bottom left corner of the library settings box.
Lastly reviewed the 13 settings to verify and correct any settings that are new in 13 or did not make the parameter changes injected.
It wasn't difficult and did not take too much time. Bonus is now all the parts could take advantage of any new 13 features.
HTH
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"