Usually, it's because of the financial evidence they need to supply. Normally, for the first study permit application, it's often the consulate that does the checking. Quebec often accepts the application, but then finds itself in the black box. If we were at least told that it was a money problem, then we would know that the financial evidence was inadequate.
Just recently, a few weeks ago, I saw a student who had his year of tuition fees paid by the Student Direct Stream, which deposited the amount he requested in trust at the Desjardins Caisse Populaire, and allowed a month for the application to be processed. He too was refused, even though the funds were already here. That's the crazy sort of stuff we're encountering.
But it's still possible to acquire more interns, if only to decrease the risks. A relatively interesting measure was introduced not long ago, allowing universities to have interns for up to 120 days. That doesn't require a work permit. It's a helpful measure that gives universities and companies an opportunity to test people to see if they might be useful, with a view to hiring them or conducting a research project with them.
Basically, the problem is always this black box. We think that it's because of the money. And yet as shown in the last case we mentioned, with the person who had sent everything required, he received the same response to the effect that there was nothing to prove he would leave after graduating.