Problem observing variables in the Locals window. There is a structure containing a bit field of type int (signed integer 24 bits). When displaying a negative number (for example, -1 as in the screenshot), an unsigned integer is displayed, and a negative one is needed. When the compiler has permitted to collect code with type "int" and the same type is specified in the debug window. This is probably an error and should display "-1" instead of "16777215". 

Thank a lot, respectfully Vladimir Burov!