Unspecified error - which log file to examine?

Every time I login to my desktop (Disco Dingo - Mate 1.20.4) I get the attached window pop up

System program problem detected
Do you want to report the problem now?

Screenshot%20at%202019-04-25%2010-57-10|516x193

Problem is it doesn't really give me (a fairly noob) a clue as to which log file I should go and 'explore' in the hope I can pinpoint the issue. Or even let me see the report to see if I can glean some insight to maybe try a few things..

Can someone shed some light please?

Please see post number five where I describe how to "fix" this situation - Need Help Gathering Info to Report 19.04 Upgrade Bugs