Does rendering the timeline help?
I'll give that a try
Also note that, when you're editing the speech bubble, you're in the Titles Adjustments workspace -- which shows the speech bubble and title at full screen size.
When you return to your timeline, the speech bubble will appear at the size you've sized it to.
So, if you make it very small while you're editing it, it will be VERY VERY small when you return to your timeline.
As Bob Peru suggested above rendering the time line did not help.
Steve what you have mentioned is exactly what happens; therefore, I find it hard to control the final outcome.
What I have resorted to is that I add the speech bubble to the photo in Adobe Photoshop and than import it to my timeline. That way I can control the outcome.
Thanks for the information, it is always welcome and helpful.