Bug#767709: bug is actually with system-monitor extension

This bug actually occurs only when I use the System-monitor extension found here: https://extensions.gnome.org/extension/120/system-monitor/

Bug#767709: general: nvidia 340.46-3 + latest jessie updates = periodic GUI hickup

Package: general Severity: important Dear Maintainer, *** Reporter, please consider answering these questions, where appropriate *** * What led up to the situation? * What exactly did you do (or not do) that was effective (or ineffective)? * What was the outcome of this action?