GDirections.load fails

We use GDirections to get route directions between two points, and it
worked a few months ago!
Now we have a problem of "Failed to obtain directions, code 602" for
most of queries.
If we send exact address including street type – it works.

For example, this query is working:
"from : 1 rivoli st paris france to: 1 gobelins av paris france"

And this one doesn't work:
"from : 1 rivoli st paris france to: 1 gobelins st paris france".

Or
"from : 1 rivoli paris france to: 1 gobelins paris france"

But user not always knows what type of address is it: street,
boulevard or avenue.

Yes, we can use the coordinates as the input to GDirections, like in
Econym example:
http://econym.org.uk/gmap/example_multi2.htm
But I just want to use this format: "from: address 1 to: address 2",
one action instead of three.

From API reference:
"The query parameter is a string containing any valid directions
query."

What is "valid"?

Thanks.

P.S. I checked other posts.

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