I have the same problem with the 'Sync' option being greyed out after doing a recompile of the bleeding edge version (using my own script or Nou's astro-soft-build scripts). This has been an issue for at least a few weeks for me.

I get around it by running Nou's build-soft-stable.sh script after running my own bleeding edge script which doesn't do an install as the last step, leaving 2 versions of kstars available for me, the installed stable build, and a separate folder for the bleeding edge version.

Note that running Nou's build-soft-latest also (for me) leaves me with a missing Sync option. The fact that running his stable build afterwards fixes the problem is curious, as when I run the lastest bleeding edge code from my own directory, the sync works (only after his stable build).

Sorry if this is a confusing explanation.

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