Today I tried using PD (0.56-2) and objects are gone (although I used some in the past). I tried redownloading PD but didn't work. Any suggestions?

These objects are externals that come with Pd-vanilla. What's your OS? I think it's a path issue. Pd doesn't have the path where these are installed in its search paths. On Linux for example, this is /usr/lib/puredata/extra, but this is in Pd's search path by default.

Worked, thanks!