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Given Ubuntu's (and therefore ROS's) long-term goal of python3 compatibility, you should probably report this as a bug in the the qt_gui package: https://github.com/ros-visualization/qt_gui_core/issues

Depending on how python-savvy you are, and how long you want to wait for a fix, there are at least a few ways to proceed:

• Wait for the upstream maintainers to fix the python3 compatibility bug. Since this doesn't affect any other users, and doesn't affect the default configuration, this may take a while.
• If you know python well, you can attempt to fix the bug yourself and submit it as a pull request.
• Uninstall switch the default version of python back to python 2.7, without anaconda
• I'm not very familiar with Anaconda, but I've seen a few posts indicating that, with some effort, it can be made to work. This suggests that there's a version of Anaconda for python 2.7 that may be more compatible.