On a very very laggy Core 2 Duo laptop, I sometimes get crashes on debugger startup:

void CPatternEditor::DrawScreen(CDC *pDC, CFamiTrackerView *pView)
{ ...
	ASSERT(m_pPatternDC != NULL);
	ASSERT(m_pHeaderDC != NULL);
	ASSERT(m_pRegisterDC != NULL);		// // //

they're all null, the asserts fail on debug, and the program crashes on release.

Starting Dn-FT with the pattern editor off the bottom of the screen, triggers the same bug on Windows 10 (but not 7 with/without compositing on).