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When I paste a URI and click Check, Opera v7.53 crashes. The same problem occurs when I use Opera's built in Validate Source function, which links to validator.w3.org. This problem first appeared about two months ago. I also use Opera v9.22 and IE v6.0 and the validator works without problems.
This is certainly a bug in that (now very) old version of opera - not the validator's results pages. Since you mention that newer versions of opera do not display the issue, I move to close the bug.