Hi Vikram and Lilybiri,
Thanks for your responses :-)
I'm working on Windows 8.1... I think that I may have found the issue... I was saving the file in a project directory rather than the default My Captivate Projects folder...
Perhaps Captivate was struggling to find resources it needed?
It hasn't crashed for a while now, though it is struggling - I'm working with a 54 slide PPT presentation that is linked and it takes a very long time to interact.
Sometimes it says that I've removed slides, which I haven't?
Best,
Christy.