by Kevin Siegel 
Maybe I was imagining things… but I set a pesky text caption to a specific size. Later on, when I re-opened the slide, the caption was much smaller. I attributed the episode to drinking too much coffee.
But then it happened again!
I resized a text caption to a very, very specific size–no doubt this time. At some point I used the spell check feature (Project > Check Spelling). There was a typo flagged in that very same caption, which I naturally allowed Captivate to fix. And bam! The caption resized.
Has this happened to you? It's not a bug… it's not your caffeine intake… it's a feature… and one that I'm not very fond of. If you resize a text caption or button in Adobe Captivate, and then edit the object's text at all, the object will do you a favor and resize. If you're someone who doesn't appreciate this particular kind of "favor," here is how you disable the feature.
- Display Captivate's Preferences (Edit menu for Windows users; Adobe Captivate menu for Mac users).
- From the Global group, select Defaults.
- From the General area, consider removing the check marks from Autosize Buttons, Autosize Captions and Calculate Caption Timing.
With these three options disabled, Captivate will no longer resize your objects and change object timing on the Timeline. Careful though. From this point forward, it's possible that your captions can be too small and that the end of the text can get cut off. You'll need to ensure the captions are big enough to accommodate the text. On the other hand, you'll be able to return to your previous caffeine level.
Note: The General preferences you set above will not affect legacy projects. If you set the preferences prior to creating a project, all new projects will follow the preferences. The existing projects will need to be altered, one at a time.