Any crash in 13w37b...13w41a triggers the "modded" message of the Launcher
Crash report says game is modded but it isn't
On crash, launcher is stating the game is modded when the crash report says it is not
"your game may be modded" on unmodded clients
False Positive on Unmodded Game
Game crashes, launcher says game is modded even when it isnt
ArrayIndexOutOfBoundsException crash when loading singleplayer world. Launcher said my game is modded and wouldn't send report, it is not.
Upon a crash, Issue Tracker said I had "modded version" of Minecraft and rejected the report.
Vanilla 13w36a find suspicious class
Launcher treats crash report as modded / bottom part of crash report missing
False positive detection of modded minecraft when crashed by stack overflow