gistfile1.txt

- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
	UITouch *touch = [touches anyObject];
	if (CGPointEqualToPoint([touch previousLocationInView:self], [touch locationInView:self]))
		[controller toggleToolbars];
	
	[super touchesEnded:touches withEvent:event];
}

The resulting stack trace, 2nd time around:
#0	0x00009f84 in -[ScreenshotsScrollView touchesEnded:withEvent:] at ScreenshotsScrollView.m:22
#1	0x30adb8e5 in forwardMethod2
#2	0x30a7dc17 in -[UIScrollView touchesEnded:withEvent:]
#3	0x0000a035 in -[ScreenshotsScrollView touchesEnded:withEvent:] at ScreenshotsScrollView.m:25
#4	0x30a6790f in -[UIWindow sendEvent:]
#5	0x30a56ff7 in -[UIApplication sendEvent:]
#6	0x30a561d8 in _UIApplicationHandleEvent
#7	0x31563dea in SendEvent
#8	0x3156640c in PurpleEventTimerCallBack
#9	0x95581615 in CFRunLoopRunSpecific
#10	0x95581cf8 in CFRunLoopRunInMode
#11	0x31564600 in GSEventRunModal
#12	0x315646c5 in GSEventRun
#13	0x30a4ec98 in -[UIApplication _run]
#14	0x30a5a094 in UIApplicationMain
#15	0x00002606 in main at main.m:10

And the hacky fix:
- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
	if (!inTouchesEnded) {
		inTouchesEnded = YES;
		UITouch *touch = [touches anyObject];
		if (CGPointEqualToPoint([touch previousLocationInView:self], [touch locationInView:self]))
			[controller toggleToolbars];
	
		[super touchesEnded:touches withEvent:event];
		inTouchesEnded = NO;
	}
}