So I'm working on a timeline right now in Premiere Pro CC 2015, however, when I press play the program monitor randomly zooms in. When I press pause the image goes back to it's original size. I made sure that the sequence settings match the video files. I only seems to happen with my JVC GY-HM200 footage. Whenever I edit with my Sony a7s footage, it works fine.
Any one have a solution to this? It's extremely annoying to edit with.
I found the solution thanks to Adobe technical support. You need to purge your cache. Before the latest update, you could go into Preferences>Media, and there would be an option to clean... but it looks like they've removed this feature. So I'm assuming what you can do is find the root folder for your cache, and delete the current folders... or at least delete the contents inside the folders.
Hopefully that should fix the problem. Let me know if you have success.