Version 6.4.1 of Astah Professional, Astah UML and Astah Community for Windows, Mac and zip archive has been released today. This is a bug-fix release that has fixed the compatibility problem between .asta and Java 1.6.0_26 and earlier (Please read the detail of this issue here) and few other bugs. We plan to release Version 6.4.1 for Linux both RPM and DEB packages in next week. (Version 6.4.1 for Linux was released on August 2nd)
If you are using version 6.4, please update to the latest 6.4.1. Upgrade/Download is available from the URLs below.
Astah Development team