Summary

The "Checking for updates…" window briefly flashes onto the screen before being immediately replaced by the subsequent panel (update found, no update, or an error). The flicker is most reproducible by pointing SUFeedURL at a garbage URL: the network failure comes back so quickly that the checking window is visible for only a frame or two before being torn down to make way for the error alert. Even with a valid feed, a response on a fast network connection can lead to the same problem.

Possible Fix

Pull request forthcoming.

Version

Sparkle 2.x branch.