IBM COBOL for Linux display bug finally fixed it took days as it was masked by other things Claude documents the fix: Second Bug: Display Output Corruption — Investigation Log (2026-05-13) Summary IBM COBOL for Linux 1.2.0 has an internal output state corruption bug that manifests when programs produce large volumes of DISPLAY output (hundreds of articles / thousands of lines) via a PTY. Symptoms include: Separator lines ( https://felixquinihildebet.wordpress.com/2026/05/13/ibm-cobol-for-linux-display-bug-finally-fixed/