I'm a very late adopter when it comes to OS upgrades. I waited almost a year to upgrade to Yosemite, and it can tell you that it is well worth it. At this point you shouldn't see any OS issues or compatibility issues (except for apps that have been abandoned).
####All of the great new features in KM7 are alone a great reason to upgrade.
For more info, see Any Issues for Upgrading to Yosemite?
####Since you are running KM6, here's how to post your macro (code and image):
- Click on the macro name in the KM Editor
- Goto File > Export Macro, and save wherever you'd like
- Goto Edit > Copy as > Copy as Image
- Open Mac Preview app, and goto File > New from Clipboard, and save.
- Go to this KM forum thread, and click on reply
- Enter some descriptive text,
- Use the file upload button
in the KM Forum Editor to upload both files.