Did the unity 3.5 asset workflow change?

I had posted that on the unity forums that I had a major problem after I installed the final release of unity 3.5. My models had odd behaviors. I would drag and drop the model in from my folder as usual and when I pressed play it would move towards (0,0,0)on its own with no script attached. With a script attached , it took roughly 20 seconds to have it recognize and move using the input. The models were perfectly valid and worked before.

After making a blank game object, setting its properties to have my model, and giving it a bounding box, i was able to not have this problem. All work continued on as normal(So far) with this extra step.

My question is did the unity 3.5 workflow change to make this the way we import models in our edit view so we can use them in our games? Where any other assets affected by this?

Thank you

[Side note]- The way I saw this was because my old projects were not working.

Sounds like a bug. Simplify the project and then send it to the QA team to look at. They can compare the 3.4.2 and 3.5 behaviour of your project.