After several font changes captions stop previewing
Noticing that if you make changes to the fonts and then keep tweaking, eventually Premiere just stops updating the preview of the captions and you need to close Premiere and manually clear the caches to solve.
Also finding that the drag to zoom will often get stuck in that target cursor mode not allowing you to do anything except restart Premiere to get your cursor back.
Overall the whole caption system in Premiere is pretty buggy.
We have completely redesigned the captioning workflow in Premiere Pro version 15.0. You will see many dramatic workflow improvements. Please update to the latest version.
Learn all about the new captions workflow here: https://helpx.adobe.com/premiere-pro/user-guide.html/premiere-pro/using/working-with-captions.ug.html