Hi Cyber Sinh,
I spoke to the development team and they did a fresh test (downloaded the package from the site and ran a test project), and the bug no longer occurs.
If you are still able to reproduce the problem, please send us a sample project which demonstrates how you were able to trigger it. (please send it to support@xceed.com and include a link to this forum thread as a reference).
** Quick Tip: Clients with an active support subscription should be sending their questions by email if they wish to benefit from the faster response time. Thanks!
Diane Lafontaine
Technical Support
Xceed Software Inc.