I've recently upgraded to ArcGIS 10.5 from 10.3.1 and am experiencing some issues associated with running geoprocessing tools as a batch.
The first issue is that when I run the tools as a batch process they will no longer run in the background, even though background geoprocessing is enabled. I never had this issue in 10.3.
The second issue is that if I have an error with the batch processing, I normally fix the error/issue that was causing the error and reopen the batch processing input window from the results so I don't have to reconfigure the window. However when I open the window in 10.5 only the first row is completely filled out and the rest of the rows output feature class is greyed out, like in the attached image.
The last issue minor issue is that the batch process only outputs/adds into the map the first row/input of the batch process unlike in 10.3.1 when it adds all the outputs to the current map.