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kamper
Are you using some firewall / antivirus / antimalware or something software?
I saw the almost the same behavior at one system with Outpost Firewall. Apex selfclosed without any chash message (and exceptioninfo log) if in one of the Apex tabs (search, up/down history logs) appears large list (more than 100 lines).
That problem was solved by switch off "Anti-Leak Control" for apex process in Outpost.
May be you have similar problem?