definition of a word (for e.g. dw) in Perl syntax

Hi folks

Recently, the Perl syntax definition in vim (version 7.4) has considered a word to be much bigger than it used to. For example, I would expect

abc::def::ghi

to be considered 5 words, so that when I press dw while sitting on a, it should only remove abc. However vim now deletes the entire string when the syntax is Perl, and it's driving my nuts!

I have no idea what is causing this. I've tried setting a few random :set options but no luck, and nothing obvious showed up in the perl syntax file. I can't even think what part of :help to start reading.

HELP!

Thanks in advance,
aclarke

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