I was reordering my layers, then this just popped:
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Construct 2 Check failure
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Check failure! This is probably a bug:
Set sort order incorrect: look for instance Z orders being modified without SaveSelection()/RestoreSelection()
Condition: std::is_sorted(selected_instances.begin(), selected_instances.end())
File: Editors\CLayoutView.cpp
Line: 316
Function: void __thiscall CLayoutView::DoDraw(bool)
Build: release 60 (32-bit) checked
Component: Construct 2 IDE
(Last Win32 error: 0)
You are using a 'checked' release of Construct 2, intended for testing, which causes certain errors to be reported this way. Hit Ctrl+C to copy this messagebox - it's useful information for the developers, so please include it with any bug reports! Click 'Abort' to quit (unsaved data will be lost!),'Retry' to turn off messages for this session and continue, or 'Ignore' to continue normally.
O~o"
EDIT: Layers ordering Locked after that, had to reopen Construct 2.
db.tt/n1MfSLc1