Switching back to single task crunching doesn´t work

Hallo!

Some weeks ago, I adjusted my preferences for crunching 2 tasks at once for BRP7 by setting the CPU-Load factor to 0.500. After a while it worked.

As the test showed, that this mode is less efficient in my configuration, I tried to switch back to single task crunching by setting the CPU-Load factor back to 1.00. But that didn´t work, even after prolonged waiting. Why ?????

So, I modified my cc-config file by adding an app-config. It´s now this:

<cc_config>
   <options>
      <use_all_gpus>1</use_all_gpus>
      <exclude_gpu>
         <url>https://einstein.phys.uwm.edu/</url>
         <device_num>0</device_num>
      </exclude_gpu>
   </options>
   <app_config>
   <app>
      <name>BRP7</name>
      <max_concurrent>1</max_concurrent>
   </app>
   </app_config>
</cc_config>

But in my event log I get the hint: unrealized tag in cc-config.xml: <app-config>. But I don´t see, what´s wrong??? I took this part by drag and drop from the client configuration page and deleted all unnecessary lines. I tried also a version without success, which included

<gpu_versions>
  <gpu_usage>1.0</gpu_usage>
  <cpu_usage>.9</cpu_usage>
</gpu_versions>

As I´m no programmer, I hope for the sharp eyes of an experienced programmer.

Kind regards and happy crunching

Martin