There are several new bugs discovered in the beta release jnetpcap 1.3b1. These are all fixed now and the same fixes are applied to the 1.4 branch. Due to the fact that not just one, but several bugs have been found, we will be going through the release-candidate process. This means that next release after 1.3b1 will now be 1.3.0.rc1 and so on, until no more bugs are found and the final 1.3.0 production quality release.
For a complete list of bugs so far, please visit the jnetpcap.1.3 release overview page: