retouch module: can no longer increase brush size with mouse wheel

In version ca065eg: when I select the brush tool in the retouch module, I get a very small brush which I cannot enlarge by turning the mouse wheel. The numerical value is displayed at the top of the picture and does change when turning the wheel. The brush tool does behave as usual in other modules, e.g., exposure or surface blur, i.e., I get a decent-size brush to begin with and can control its size with the wheel.