Text issue in SL2

Hi

I'm working on a simple module, converting from powerpoint. 

Most slides have audio on them, but otherwise are very simple and have very few animations/interactions at this point.

I've done three scenes, and today when I went back to the second scene, most of my text has moved around into very wide boxes that hang off the edge of the slide, most by a lot.  Some of the slides in my third scene have also moved around.  The text settings have not changed, it just seems to be the text box size.

Any idea what's going on?

I've attached a screenshot - you can also see that the slide preview looks as it should until I click on one of the text boxes to resize it back.

I'm on update 6 just now and currently updating to 7, but couldn't see anything in the release notes about a known bug.

Thanks

Nic