It seems that the Pets patch has borked most of the cc objects. This does not include hair or clothing and most deco items will be fine as well but all objects that have slots (for other objects or Sims) are most likely not usable anymore (some of the older stuff still seems to be).
Read all about it over at MTS
- Sims 3 News – New TS3 Patch and Existing Custom content
- Information – Collections! Finally! And..er yeah, patch 1.26/1.27
s3pe is being updated as I post this and Workshop will be soon too. Creators will need to fix their stuff.