It has come to my attention that some users that have installed the Java Runtime Environment (JRE) and not the Java Development Kit (JDK) are experiencing multiple problems associated with com.misc.Hashing. While this does not appear to affect all users, if you are affected, please install the JDK. It should resolve your issue.
Symptoms that you may be affected include tabs not loading/opening. To verify, you can run it in command line and look for errors about NoClassDefFoundError for com.misc.Hashing.