I haven't played on an MP server with integrity check turned on recently but on one ocassion a few weeks ago, I did get the "failed" message which was probably due to the snap view changes (in fairness though I have been changing other views as well so I don't know if it was the snap view changes that caused the problem). In addition, on some MP servers the snap views revert to defaults so perhaps there is a way for the server to enforce the default and not allow custom snap views while allowing the client to pass the integrity check.