Looks like it must have been a nightmare for both the server and students trying to get in at 10 AM and earlier on today. I decided to sleep in after watching the World Cup and started creating mine a few minutes ago. On my end, I've experienced no problems with the timetable. I got everything I wanted, including successfully switching to ALL the psychology tutes available with no problems.
The only thing I need to do is wait for a pending subject change request and find a way to squeeze that onto my timetable.
Despite all the negative comments, I can only praise UoM for changing to the new system because unlike our friends (or rivals depending on how you look at it) at Monash, we've had our timetable generated for us in previous years and if you're doing a course which has a gazillion contact hours, then it's hard to change lecture streams and tute times to suit your availability especially if they are full. With this new system, we can create from scratch to work around us.
Personally, I've found this system easy to use. Some negatives are that it's very slow to load and I've had one error page so far. Also, it is also very crowded and there's a lot of information to take in. Can you imagine a brand, spanking new Jaffy in 2011 trying to create their own timetable with this system? I would imagine they would get heart palpitations and just die of a heart attack before the semester even starts considering all the administrative tasks they would have had to do beforehand.