Let me clarify. When I boot up !slingshot, everything works, including (command) or any lisp functions I've written (which get loaded on startup).
But, after I copy an entity, typing lisp functions in the commandline no longer works (giving "; error: no function definition:" then the function name (ex. (COMMAND)).
If I try to run one of my custom lisp functions (for example, SPGRID - but the same happens with any other custom function) - it doesn't run, and the function name w/ C: is returned (so for the example, that would be C:SPGRID).
Except for the way it returns the function name, it's almost as if all lisp functions get unloaded when copyclip is run.