Possibly upgrade to https://github.com/patternfly/patternfly/releases/tag/v3.3.4 which uses Bootstrap 3.3.6.
Changes to 3.x: https://www.patternfly.org/get-started/patternfly-migration-guide/#3.0-migration-guide
JS Libraries path have changed, likely to impact html direct references.
Upgrade gwtbootstrap to version 0.9.3 which also uses Bootstrap 3.3.6
https://github.com/gwtbootstrap3/gwtbootstrap3/releases/tag/0.9.3
Bootstrap 3.3.6 release info: https://github.com/twbs/bootstrap/releases/tag/v3.3.6