I try to receive the JSON of a Google Spreadsheet Worksheet. It worked till some days ago. For the default worksheet it still works, but not for all other worksheets.
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ChrisPeterson's note:
You can use worksheet position number (1 for the first/default worksheet, 2 for the second worksheet).
Original answer
I came across the same issue and I managed to find my way out. It seems that they recently changed the id for each worksheet.
You can find the new ID at the following
https://spreadsheets.google.com/feeds/worksheets/YOUR_SPREADSHEET_ID/private/full
I got something like o3laxt8 between tags
Ps: od6 anddefault values will always work and redirect to the first worksheet of your document.
Joe Germuska' note:
od6 doesn't work anymore
Seems to work again.