NSTextView hangs while typing

I'm experiencing hangs while typing on an NSTextView. The NSTextView is on a window that I run modally.

[NSApp runModalForWindow:[self window]];

I开发者_如何学C'm not really sure how, but I think it has something to do with the scrollbars. When I click the "enter key" until it starts scrolling down, it always hangs.

Can you please help me how to debug this? Regards, Jose.

I removed the NSTextView on InterfaceBuilder and added again and it stopped hanging... Too bad I didn't found out why...