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In my case it returns-  S::STARTUP - as it should:

Command: (defun S::Startup (princ “Startup is loaded”) (+ 47 11) )

S::STARTUP

Command:

How do you want to use this function and where do you put it (the name of .lsp file)?

Maxim

As about princ function - in my case it works as it should.

If I'd load this AutolISP routine:

(defun c:test (/)
(princ "\nStartup is loaded")
(princ "\n")
(setq a (+ 47 11))
)

and then execute TEST command, it returns:

Command: test
Startup is loaded
58
Command:

Maxim

Sorry, my fault, it is not the Add button, it is the New button.

If I put (load "tetraeder") in the s::startup I get "invalid parameter", but I can use this at the prompt and it works.
Even if I put it in the startup.lsp I get no error, but it will not executed.
if there is no better solution, I have to load all needed files manually or put all function definitions into the startup.lsp.
This is unacceptable.