Hey Violet, I'm a current second semester student at York's OT program.
I had the same hesitation when applying last year, so I did some research. When I found the probation statements KJ has nicely quoted above I was inclined to find out more. It's one thing to know the program's accreditation status, but another to understand why it had earned that status and what was being done to address it.
I emailed ACOTE and got a reply from a representative several weeks later. She explained that York was on probation for low NBCOT pass rates and included a chart detailing the year of examintation / the number of students who took the exam / the number of students who passed. I will search for this email so I can quote it directly (and then I can forward it to you, if you'd like). I also asked how often do schools on probation lose accreditation and she said it is unlikely, but of course, will differ on a case by case basis. She said if the school does lose accreditation students will not be eligible to sit for the certification exam.
Now, when I contacted the department about what they were doing to raise pass rates they said that primarily they were introducing a method of in class testing more similar to the actual exam. This was to include an emphasis on critical thinking/analytical questions, as well as a switch to computerized testing which appeared to be an issue with past and current students.
Last semester we (the first years) did experience this pattern of high grades on paper tests / low grades on the computer based ones in the beginning. Our midterm and final grades were an improvement. I am always hopeful when I hear that the years ahead of us are doing well because come 2015 the fate of our program really lies in whether enough of them have passed the examination.