Kindle Fire (2nd Gen) here and same problem.
For a temporary work-around until this is actually fixed:
You can get around it by starting a new campaign, then exiting back to the main menu once it starts and then loading your existing campaign.
Of course, you'll have to delete your new campaign again afterwards.
Yes, if you begin a new campaign and just get to the opening of the intro to the first hero turn, you can quit campaign, then load your previous other campaign. Until I did this, my previous campaigns would crash when trying to load. This fix seems to have permanently fixed the issue for me though.