Same problem here - and it does not work in the YQL Console either - see below...
YQL Console Query
select * from yahoo.finance.historicaldata where symbol = "YHOO" and startDate = "2009-09-11" and endDate = "2010-03-10"
And here is the relevant diagnostic output
"javascript": {
"name": "yahoo.finance.historicaldata",
"verb": "select",
"content": "The current table 'yahoo.finance.historicaldata' has been blocked. It exceeded the allotted quotas of either time or instructions"
}
This is a major problem that needs a fix ASAP.
Thanks for jumping on this as soon as possible...