Sometimes the CMFR report shows a white screen of death. This occurs when the requests are large, for example when encoding attachments.
Some technical background. The shown report is created as a Drupal view. When this view is rendered, the rows of the civicrm_api_call are loaded in memory. Before showing the request (or the response) column, it is limited to 46 characters. In the situation that the column is large, for example several MB, it can drain the amount of available memory.
The report can be edited in the same way as a view. Use this possibility to remove the field's request, and respond from the view. This makes it more difficult to recognize a row. The complete message can be still seen by selecting one row.
To edit the view use the link `https://server/admin/structure/views/view/cmrf_calls`
Closed: won't fix
2.0
Code