stringWithContentsOfFile works, but requestWithURL doesn't - iphone

Question

For some reason, the first method doesn't display anything, while the second does:
//Common
NSString *path=[[NSBundle mainBundle] pathForResource:#"about" ofType:#"html"];
//Method1
[webView loadRequest:[NSURLRequest requestWithURL: [NSURL fileURLWithPath: path isDirectory: NO]]];
//Method 2
NSString *HTML=[NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:NULL];
[webView loadHTMLString:HTML baseURL:[NSURL URLWithString:[[NSBundle mainBundle] bundlePath]]];
//Common
UIViewController* controller=[webView controllerWithTitle:#"Help"];
[delegateRef.navController pushViewController:controller animated:YES];
On the other hand, I also tried loading it using a URL as well. Similarly, the first method didn't display anything while the second did.
//Common
NSURL *url=[[NSBundle mainBundle] URLForResource:#"about" withExtension:#"html"];
//Method 1
[webView loadRequest:[NSURLRequest requestWithURL:url]];
//Method 2
NSString *HTML=[NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:NULL];
[webView loadHTMLString:HTML baseURL:[NSURL URLWithString:[[NSBundle mainBundle] bundlePath]]];
Strangely, if I change the URL as follows, then both methods work (of course loading the string doesn't show css):
NSURL *url=[NSURL URLWithString:#"http://www.google.com"];
controllerWithTitle is defined in a category as follows:
-(UIViewController*) controllerWithTitle:(NSString*)title{
UIViewController *vc=[[[UIViewController alloc] init] autorelease];
vc.view=self;
vc.title=title;
return vc;
}

Answer 1

It turns out that the CSS was causing the entire page to not display!