RE:Have you ever seen that before?
Is it possible that that their legal cousel for the ASC investigation told them to (with IIROC and/or the ASC's permission)? It makes perfect sense to me that press releases being investigated for flashoods would be pulled to protect new investors who may get confused. With webcrawlers and such, there's a risk that the junk news gets propagated even more widely if they are left online.
The subsequent releases that say: "Uh-oh, the ASC is really mad at us!" may be considered enough of an explanation.
I don't see it as a weasely or irrsesponsible thing. Leaving it up would probably do more harm than good.