Hijacking the top post, this is FIXED in macOS 13.5.

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macOS Ventura 13.3 beta 2 seems to severely break screen savers on multimonitor systems.

(This is not specific to Aerial, but describing it here in case others are wondering)

I just reported this issue to Apple as Feedback Case FB12023530:

To reproduce:

• on a M1 MacBook Air with a second monitor connected
• open System Preferences / Screen Saver and select the Message Screen Saver
• click the Preview button
• Expected behavior: screen saver should run on both monitors
• Actual behavior: screen saver runs on 2nd monitor only.
• Actual behavior: the screen’s rectangle seems to be offset by about 100 pixels (as if the NSView is not set to the actual screen coordinates)

Regression:

• this worked fine in 13.2
• this also affects third party screensavers such as iScreensaver and Aerial
• this doesn’t affect all first party Apple screensavers, e.g. “Hello” and “Flurry” work fine, but “Message” does not