As we noted to you guys upon release, Cydia 1.1.19 was a major upgrade for Cydia. As such, it was inevitable for a few bugs to surface with all of the under-the-hood changes.
In Cydia version 1.1.20, saurik has addressed many of these bugs in what he is calling a bug fix release. If you're encountering problems while using Cydia, it's definitely suggested that you upgrade to the latest version as soon as you can.