I'm seeing two consistent issues with the process replays(ES2 SP2).
One is that workbench completely crashes when I replay a specific process. A workaround that I've found for this is to open the process first in the editor and then select a process instance to replay.
The second issue is that I can't delete process recordings. When I pick the delete recordings option, no process instances appear in the list. I can replay the recordings, though, so I know there are several.
Is anyone else seeing these issues?