I'm getting the same issue - in the console I get the following errors:
Uncaught directCanvas error: document.addEventListener is not available in directCanvas canvas.html:401
Uncaught TypeError: Cannot set property 'width' of null :58888/cow_trix_hotmail_com.rooftoprunner/3.4.0/c2runtime.js:1039
Following these breadcrumbs, I think there are two problems: some plugin is trying to use the 'addEventListener' function, which isn't supported; and (specifically in the Construct2.js file), the following piece of code:
if (this.isDirectCanvas)
{
this.ctx.width = w;
Uncaught TypeError: Cannot set property 'width' of null (repeated 2 times)
Uncaught TypeError: Cannot set property 'width' of null
this.ctx.height = h;
}
gets passed an null variable.