Fixed.
After updating to 17058
   TestRunner open
is fine again.

Thank you, Levente.

On 3/20/17, Jakob Reschke <jakob.reschke at student.hpi.de> wrote:
> Confirmed. Works in 17037, does not work in 17056.
>
> 2017-03-20 10:13 GMT+01:00 H. Hirzel <hannes.hirzel at gmail.com>:
>> Hello
>>
>> In a recent image updated to the last change opening the TestRunner
>> does not work.
>>
>> Squeak6.0alpha
>> latest update: #17056
>>
>>
>>     TestRunner open
>>
>
>