Hi Oanh,
Thanks for your comment.
Case 00376693 has been raised, should you need to contact us directly.
To be able to find a solution to your issue can you please let us know the following details:
-What OS version do you use? Windows 7, Mac 10.9?
-What version of ActivInspire do you have installed? Have you tried updating to our latest ActivInspire 1.8?
-Can you describe what happens when you save the flipchart?
-What happens if you save a blank flipchart?
We await your reply,
Haymo