Using local $_ can fail if $_ is currently aliased to something read-only. The "Localization of special variables" and "Localization of globs" sections in perlsub explained this and recommended using local *_ instead in the affected versions. You can avoid problems with also localizing @_ by unpacking your arguments into lexicals before localizing *_.
Beginning with perl 5.14, local $_ is a special case that also strips any magic associated with $_, while preserving the other slots in *_. Since Lady_Aleena mentions that her Web host is using a perl older than 5.14, this is a concern for our questioner.
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