I get a grey game area and the browser hangs when I try to play games in the arcade that use the pathfinding behavior. I've tested in Firefox 19 and Chrome 26 and according to the javascript console in chrome the reason for the fail is it can't load pathfind.js. The error message looks like this:
Failed to load resource: the server responded with a status of 404 (Not Found) http://static1.scirra.net/arcade/games/3969/pathfind.js
Here are three different games I've tried with the same error:
no capxhttp://www.scirra.com/arcade/example/2130/test
no capxhttp://www.scirra.com/arcade/addicting-shooter-games/4182/space-threat
with capxhttp://www.scirra.com/arcade/games/addicting-action-games/3926/go-faster
If I download the capx for the last on it previews just fine in r123.2. My system is winxp/sp3
Here is a relevant topic where two other people are having the same issue:
http://www.scirra.com/forum/grey-screen_topic65219.html
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Moving to Website Issues, Tom needs to fix this.