I have posted the most important HK GCS update for non-United States users...ever. There has been a nagging bug that has caused some serious problems if your regional settings are set to anything other than English (United States). It's not even a comma vs period for decimal place issue. It's an encoding problem. It has literally taken me weeks of effort to finally find a work-around for this bug and I've finally done it.
The symptoms were when you'd connect the GCS to your APM via MAVlink, only a portion of the parameters would download and the automatic mission read would typically fail. If you click Read enough times, you might actually get the parameters to all download and the entire mission to read, but it was a pain. With US users, this was all automatic and very infrequently (or at least in my testing) would I have a read fail.
Now, it should work for everyone!
Also check out the new joystick control for APM!!!
Please Note you'll need to add this to your APM_Config.h: #define ALLOW_RC_OVERRIDE ENABLED