LR 12.53, window.alert() not working in TruClient Web in Chrome? ...

LR 12.53, TruClient for Web in Chromium.

I have some JavaScript to access VTS that looks to be working fine in FF and IE. But I get Syntax errors in Chromium. So I try to debug with some window.alert() statements. But when I play in VUGen, it looks like Chromium just blows right by the window.alert statements without displaying the message boxes.

Has anyone else seen this? Do I have an option missing?