diff --git a/uppsrc/Core/Random.cpp b/uppsrc/Core/Random.cpp
index e589f13ee..9c3143da5 100644
--- a/uppsrc/Core/Random.cpp
+++ b/uppsrc/Core/Random.cpp
@@ -74,14 +74,19 @@ static void sSeed(uint64 *s)
 force_inline
 static uint64 *sState()
 {
+	static bool forked;
 	thread_local uint64 *s;
-	if(!s) {
+	if(!s || forked && Thread::IsMain()) {
 		thread_local uint64 state[4];
 		s = state;
 		sSeed(s);
 #ifdef PLATFORM_POSIX
-		if(Thread::IsMain()) // non-main threads do not work with fork anyway
-			pthread_atfork(NULL, NULL, [] { sSeed(s); }); // reseed random generator after fork
+		if(Thread::IsMain()) { // non-main threads do not work with fork anyway
+			ONCELOCK {
+				pthread_atfork(NULL, NULL, [] { forked = true; });  // reseed random generator after fork
+			}
+			forked = false;
+		}
 #endif
 	}
 	return s;
diff --git a/uppsrc/CtrlCore/Ctrl.cpp b/uppsrc/CtrlCore/Ctrl.cpp
index 2319ba934..ac6032bb0 100644
--- a/uppsrc/CtrlCore/Ctrl.cpp
+++ b/uppsrc/CtrlCore/Ctrl.cpp
@@ -529,6 +529,7 @@ Ctrl::Ctrl() {
 	destroying = false;
 	multi_frame = false;
 	frame.frame = &NullFrame();
+	frame.SetView(Null);
 	enabled = visible = wantfocus = initfocus = true;
 	editable = true;
 	backpaint = IsCompositedGui() ? FULLBACKPAINT : TRANSPARENTBACKPAINT;
diff --git a/uppsrc/CtrlCore/CtrlFrame.cpp b/uppsrc/CtrlCore/CtrlFrame.cpp
index c29eaa19c..a9a8bdffa 100644
--- a/uppsrc/CtrlCore/CtrlFrame.cpp
+++ b/uppsrc/CtrlCore/CtrlFrame.cpp
@@ -10,6 +10,7 @@ Ctrl::Frame Ctrl::AllocFrames(int alloc)
 	size_t sz0 = alloc * sizeof(Frame);
 	size_t sz = sz0;
 	m.frames = (Frame *)MemoryAllocSz(sz);
+//	memset(m.frames, 0, sz); _DBG_
 	m.multi.alloc = alloc + (int)((sz - sz0) / sizeof(Frame));
 	return m;
 }
@@ -42,6 +43,7 @@ void Ctrl::InsertFrame(int i, CtrlFrame& fr)
 		else
 			memmove(frame.frames + i + 1, frame.frames + i, (frame.multi.count - i) * sizeof(Frame));
 		frame.frames[i].frame = &fr;
+		frame.frames[i].SetView(Null);
 		frame.multi.count++;
 	}
 	fr.FrameAdd(*this);
diff --git a/uppsrc/CtrlCore/GtkDrawImage.cpp b/uppsrc/CtrlCore/GtkDrawImage.cpp
index faae07b14..e1dee0472 100644
--- a/uppsrc/CtrlCore/GtkDrawImage.cpp
+++ b/uppsrc/CtrlCore/GtkDrawImage.cpp
@@ -114,6 +114,8 @@ Draw& ImageDraw::Alpha()
 	if(!alpha_surface) {
 		alpha_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, isz.cx, isz.cy);
 		alpha.cr = cairo_create(alpha_surface);
+	//	cairo_set_source_rgb(alpha.cr, 0, 0, 0);
+	//	cairo_paint(alpha.cr);
 	}
 	return alpha;
 }
@@ -181,6 +183,8 @@ void ImageDraw::Init(Size sz)
 	isz = sz;
 	surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, isz.cx, isz.cy);
 	cr = cairo_create(surface);
+//	cairo_set_source_rgb(cr, 0, 0, 0);
+//	cairo_paint(cr);
 	alpha_surface = NULL;
 	del = true;
 }
diff --git a/uppsrc/CtrlLib/EditField.cpp b/uppsrc/CtrlLib/EditField.cpp
index f816b9d16..72852c236 100644
--- a/uppsrc/CtrlLib/EditField.cpp
+++ b/uppsrc/CtrlLib/EditField.cpp
@@ -1053,11 +1053,11 @@ void EditField::Reset()
 	errorbg = nobg = false;
 	charset = CHARSET_UTF8;
 	alignright = false;
+	showspaces = false;
+	no_internal_margin = false;
 	SetStyle(StyleDefault());
 	SetFrame(edge);
 	font = StdFont();
-	showspaces = false;
-	no_internal_margin = false;
 	fsell = fselh = -1;
 	DeleteAttr<Image>(ATTR_NULLICON);
 }
diff --git a/uppsrc/CtrlLib/TreeCtrl.cpp b/uppsrc/CtrlLib/TreeCtrl.cpp
index b42b07072..c485558a4 100644
--- a/uppsrc/CtrlLib/TreeCtrl.cpp
+++ b/uppsrc/CtrlLib/TreeCtrl.cpp
@@ -18,6 +18,7 @@ TreeCtrl::TreeCtrl()
 	multiroot = false;
 	chldlck = false;
 	highlight_ctrl = false;
+	hasctrls = false;
 	Clear();
 	SetFrame(ViewFrame());
 	AddFrame(sb);
diff --git a/uppsrc/Draw/Image.cpp b/uppsrc/Draw/Image.cpp
index e1565b1e9..e8eefc454 100644
--- a/uppsrc/Draw/Image.cpp
+++ b/uppsrc/Draw/Image.cpp
@@ -33,7 +33,7 @@ void ImageBuffer::Create(int cx, int cy)
 	ASSERT(cx >= 0 && cy >= 0);
 	size.cx = cx;
 	size.cy = cy;
-	pixels.Alloc(GetLength());
+	pixels.Alloc(GetLength(), RGBAZero());
 #ifdef _DEBUG
 	RGBA *s = pixels;
 	RGBA *e = pixels + GetLength();
diff --git a/uppsrc/ide/clang/CurrentFile.cpp b/uppsrc/ide/clang/CurrentFile.cpp
index e6cb5dd57..48ca5c773 100644
--- a/uppsrc/ide/clang/CurrentFile.cpp
+++ b/uppsrc/ide/clang/CurrentFile.cpp
@@ -207,6 +207,7 @@ void CurrentFileThread()
 		current_file_event.Wait();
 		LLOG("Current file Thread::IsShutdownThreads() " << Thread::IsShutdownThreads());
 	}
+	s_cf.Clear();
 	LLOG("Current file thread exit");
 }
 
@@ -221,7 +222,6 @@ void SetCurrentFile(const CurrentFileContext& ctx, Event<const CppFileInfo&> don
 		Thread::Start([] { CurrentFileThread(); });
 		Thread::AtShutdown([] {
 			LLOG("Shutdown current file");
-			s_cf.Clear();
 			current_file_event.Broadcast();
 		});
 	}
diff --git a/uppsrc/ide/clang/clang.h b/uppsrc/ide/clang/clang.h
index 712c38ed0..a0c001e8b 100644
--- a/uppsrc/ide/clang/clang.h
+++ b/uppsrc/ide/clang/clang.h
@@ -135,10 +135,10 @@ struct AnnotationItem : Moveable<AnnotationItem> {
 	String nest; // Upp::Class
 	String unest; // UPP::CLASS
 	String bases; // base classes of struct/class
-	Point  pos;
-	int    kind;
-	bool   definition;
-	bool   isvirtual;
+	Point  pos = Null;
+	int    kind = Null;
+	bool   definition = false;
+	bool   isvirtual = false;
 	
 	void Serialize(Stream& s);
 };
diff --git a/uppsrc/ide/clang/macros.cpp b/uppsrc/ide/clang/macros.cpp
index 0cef42c48..fecc87c21 100644
--- a/uppsrc/ide/clang/macros.cpp
+++ b/uppsrc/ide/clang/macros.cpp
@@ -3,6 +3,8 @@
 // we are using libclang.dll for MSVC and therefore need to redefine standard macros
 // to mingw clang
 
+//#BLITZ_PROHIBIT
+
 const char umacros[] =
 R"(#define CHECK_GRID(g) 
 #define CHECK_MATRIX(g) 
diff --git a/uppsrc/ide/ide.h b/uppsrc/ide/ide.h
index 63fad3ce0..95a131e95 100644
--- a/uppsrc/ide/ide.h
+++ b/uppsrc/ide/ide.h
@@ -531,7 +531,7 @@ public:
 		LineEdit::EditPos  editpos;
 		Point              columnline;
 		LineEdit::UndoData undodata;
-		int64              filehash; // make sure undodata work
+		int64              filehash = 0; // make sure undodata work
 		LineInfo           lineinfo;
 		LineInfoRem        lineinforem;