ec46e545f5
.. lots of problems related to this, notably:
* UserChart is no longer a GcWindow so doesn't have any
properties registered.
* Even if it was the property was not being registered
by GcWindow or GcChartWindow anyway
* The value was not being initialised so checking for
NULL was kinda pointless (groan)
* OverviewItems looked up the property and never found
it, so crashes were avoided by accident.
.. One interesting point that was revealed during testing
and debugging-- the UserChart program does not honor
any filtering EXCEPT for the activity{ } function, which
although it is not by design, is quite useful.
Fixes #4021
GoldenCheetah
About
GoldenCheetah is a desktop application for cyclists and triathletes and coaches, providing a rich set of tools and models to analyse, track and predict performance, optimise aerodynamics and train indoors.
GoldenCheetah integrates with most popular cloud services like Strava and Todays Plan, imports data from bike computers, imports downloads from any website like TrainingPeaks and Garmin and will also connect to smart trainers using ANT+ and Bluetooth.
GoldenCheetah is free for everyone to use and modify, released under the GPL v2 open source license with pre-built binaries for Mac, Windows and Linux.
Installing
Golden Cheetah install and build instructions are documented for each platform;
INSTALL-WIN32 For building on Microsoft Windows
INSTALL-LINUX For building on Linux
INSTALL-MAC For building on Apple OS X
macOS and Linux: 
Windows:
Official release builds, snapshots and development builds are all available from http://www.goldencheetah.org