In KIE workbench found a major problem, the Project Explorer disappears randomly I am using kie-drools-wb-distribution-6.1.0.Final

the "Project Explorer" view on the left side suddenly disappears. It is user dependent - if I log in with an affected user from another machine, PE is also missing - and browser and OS and everything else independent.

There is no way to restore the PE permanently.

This issue has been discussed for different versions of Guvnor already:
http://drools-moved.46999.n3.nabble.com/Project-Explorer-has-dissappeared-in-KIE-Workbench-td4027767.html
https://bugzilla.redhat.com/show_bug.cgi?id=1041021
https://developer.jboss.org/thread/237501

The workarounds - changing the URL - are not permanent and seem not to work with 6.2. Also, this is no option to tell our users.

Currently, this bug is a huge blocker for us since it renders the Workbench / Guvnor useless for our users.