Cannot recognize Sys.Browser("firefox").Page(anything) in firefox 53 or 54 after update

Good evening,

Today I updated my Firefox to 54 and my TestComplete 12.30 to use the patch for Firefox 54.

After I did that, I have been unable to get TestComplete to recognize any pages I initialize with the code below.

I even tried going back to Firefox 53.0.3 and it hasn't helped.

I'm on Windows 10.

The test causes the browser to navigate to the url given. But TestComplete doesn't seem to recognize it during the test... It does recognize the Page object in the Object Browser afterward, however.

There is according to the Object Browser supposed to be a ToUrl method... I haven't ever used it successfully, or ever needed it.

I have consistently used TC with Firefox with the following code, as part of a longer routine. It's simple but it's clear. "url" is one of several different simple sites which I can reach successfully while browsing normally.

Browsers.Item(btFirefox).Run(url);
browser = Sys.Browser("firefox");

page = Sys.Browser("firefox").Page(url);

Please advise on a solution if one is known. I know this patch is new.

Thanks a lot (including thanks for the earlier help, for you who gave it).

Alex

PS: I should note that I have turned off multi-process mode as encouraged previously.