e.g. when entering a very long number like "81374562389765913874569283746592837465918645923749238475923745927349572934857" into an <intbox> a validation error appears where the content (long number) is overlapping the error message container.

this can be fixed adding the style
.z-errbox-center {
word-wrap: break-word;
}

tested and works in chrome, IE8/IE10, FF23