When i introduced one more vector (vBar4) to this class it crashes my app even if don't use it anywhere, if i comment it then everything works.

WTF is going on?

Memory corruption is your best bet.

Try compiling your release mode with debugging symbols, and examine where the application crashes in release mode.

EDIT:
As simast suggested, try rebuilding your project before assuming memory corruption.

When i introduced one more vector (vBar4) to this class it crashes my app even if don't use it anywhere, if i comment it then everything works.

WTF is going on?

Memory corruption is your best bet.

Try compiling your release mode with debugging symbols, and examine where the application crashes in release mode.