Theatregoers who signed up for e-mail newsletters for two popular Broadway musicals may be getting more than they bargained for, after it was discovered that a software glitch allowed the e-mail addresses of those signing up to be accessed by any savvy visitor to the shows’ websites. The security hole is one that has frequently been exploited by hackers to gain lists of e-mail addresses for spaming purposes. And in case you were wondering: yes, Monty Python’s “Spamalot” was one of the musicals affected.