You can tell from the error code ERR_RESULT_START that for most of your results apparently the Client couldn't start the App. The stderr reads "aborted via GUI RPC". To me this looks like something on your machine is sending Trash to the RPC port. Running any malware scanners etc.?
BM

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No, I guess. Anyway - in these cases the App couldn't even start properly. Hm, you are running a 4.19 client - how did you abort the Result? Using telnet or the boincmgr of a different client version?
BM
BM