That sounds like perl is locking up when it tries to load Crypt::RSA. It never finishes executing the use, and so never reaches the print statement. I can think of no good reason why perl would do that, and it doesn't here.

If I were in your shoes, I'd start looking at the files that Perl has to load to load Crypt::RSA. I'm going to guess that one or more of those files cannot be read for reasons that have to do with your filesystem and operating system (eg Windows file which something has a blocking lock on, or on Unix a file mounted over a misbehaving NFS connection). When you find that file, nothing will be able to read it.

You'll likely need help from a system administrator to track this down.