Continuing prop=revisions queries doesn't seem to work on pages with a lot of revisions like WP:AIV when rvuser is used.
http://en.wikipedia.org/w/api.php?action=query&prop=revisions&titles=Wikipedia:Administrator%20intervention%20against%20vandalism&rvprop=timestamp|comment&rvuser=Mr.Z-man&rvlimit=10
works just fine to return 10 edits and
http://en.wikipedia.org/w/api.php?action=query&prop=revisions&titles=Wikipedia:Administrator%20intervention%20against%20vandalism&rvprop=timestamp|comment&rvuser=Mr.Z-man&rvlimit=1&continue=
works to return 1. But when we try to continue the query:
http://en.wikipedia.org/w/api.php?action=query&prop=revisions&titles=Wikipedia:Administrator%20intervention%20against%20vandalism&rvprop=timestamp|comment&rvuser=Mr.Z-man&rvlimit=1&continue=||&rvcontinue=644715742
after a minute or so of waiting we get:
{ "servedby": "mw1229", "error": { "code": "internal_api_error_DBQueryError", "info": "[be045702] Database query error" } }
It works fine without rvuser and seems to work fine on pages with fewer revisions, and interestingly also works when rvlimit is larger (on that page it seems to work with rvlimit >3)