Quote Originally Posted by BillJ View Post
One thing I have just noticed, on the checkout page there briefly appears a red box with the JS_ERROR_OPC_NOT_ENABLED message ("Our expedited checkout process is temporarily unavailable", etc.). It disappears quickly and I don't always see it. I don't know if that is expected. I don't see it on the demo site.
I've also noticed this. I initially thought it was caused by a delay in the loading of javascript files, I made sure the min versions of OPC javascript were loaded and also disabled other scripts running on my site. I did wonder whether it was a server performance issue, but it occurs on my dev site (slower) as well as my live.

I was never able to pinpoint the cause for the brief warning message.