Thanks for all that, tobyink.  I appreciate your time, suggestions, etc.

I haven't had time to touch it again yet.  I might also try creating a small form myself, with '%40' in an element name, and do some experimenting with that to try to isolate the problem.

In reply to Re^4: Unable to check checkbox via LWP::UserAgent by tel2
in thread Unable to check checkbox via LWP::UserAgent by tel2

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