I tried to submit a comment on #2530 and got this error.

Well, it works now, 1.5 hours later.

I think that happens when you clash with someone else doing something on the Trac.  Usually I just retry and it works.

Thanks for the info. I retried probably 5 times within the space of 10 minutes. I suppose somebody could've been doing a large database operation...

Regards,
Sean