diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index 0072d2d..242d1a2 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -463,6 +463,7 @@ static cpBool s7_phys_cb_begin(cpArbiter *arb, cpSpace *space, void *data) {
     struct gameobject *g2 = cpBodyGetUserData(body2);
 
     script_call_sym_args(go->cbs->begin, s7_make_integer(s7, g2->editor.id));
+    //script_call_sym(go->cbs->begin);
 
     return 1;
 }
diff --git a/source/engine/mrbffi.c b/source/engine/mrbffi.c
index 7ae34d1..524fa10 100644
--- a/source/engine/mrbffi.c
+++ b/source/engine/mrbffi.c
@@ -24,8 +24,8 @@
 
 cpVect s7tovec2(s7_scheme *sc, s7_pointer s7vec) {
     cpVect ret;
-    ret.x = s7_vector_ref(sc, s7vec, 0);
-    ret.y = s7_vector_ref(sc, s7vec, 1);
+    ret.x = s7_real(s7_vector_ref(sc, s7vec, 0));
+    ret.y = s7_real(s7_vector_ref(sc, s7vec, 1));
 
     return ret;
 }
@@ -68,23 +68,22 @@ s7_pointer s7_ui_text(s7_scheme *sc, s7_pointer args) {
 
 s7_pointer s7_gui_text(s7_scheme *sc, s7_pointer args) {
     const char *s = s7_string(s7_car(args));
-    s7_pointer s7pos = s7_cadr(args);
-    double pos[2] = { s7_vector_ref(sc, s7pos, 0), s7_vector_ref(sc, s7pos, 1) };
+    cpVect pos = s7tovec2(sc, s7_cadr(args));
+    float fpos[2] = {pos.x, pos.y};
 
     float size = s7_real(s7_caddr(args));
     const float white[3] = {1.f, 1.f, 1.f};
 
-    renderText(s, pos, size, white, 200);
+    renderText(s, fpos, size, white, 200);
 
     return s7_car(args);
 }
 
 s7_pointer s7_gui_img(s7_scheme *sc, s7_pointer args) {
     const char *img = s7_string(s7_car(args));
-    s7_pointer s7pos = s7_cadr(args);
-    double pos[2] = { s7_vector_ref(sc, s7pos, 0), s7_vector_ref(sc, s7pos, 1) };
+    cpVect pos = s7tovec2(sc, s7_cadr(args));
 
-    gui_draw_img(img, pos[0], pos[1]);
+    gui_draw_img(img, pos.x, pos.y);
 
     return args;
 }
@@ -324,7 +323,7 @@ s7_pointer s7_set_body(s7_scheme *sc, s7_pointer args) {
             break;
 
         case 2:
-            cpBodySetPosition(go, s7tovec2(sc, s7_caddr(args)));
+            cpBodySetPosition(go->body, s7tovec2(sc, s7_caddr(args)));
             break;
 
         case 3:
@@ -402,8 +401,8 @@ void ffi_load() {
     S7_FUNC(ui_text, 2);
     S7_FUNC(ui_rendertext, 3);
 
-    S7_FUNC(gui_text, 4);
-    S7_FUNC(gui_img, 3);
+    S7_FUNC(gui_text, 3);
+    S7_FUNC(gui_img, 2);
 
     S7_FUNC(gen_cmd, 2);
     S7_FUNC(sys_cmd, 1);
diff --git a/source/engine/script.c b/source/engine/script.c
index b1b344b..24c374f 100644
--- a/source/engine/script.c
+++ b/source/engine/script.c
@@ -97,7 +97,7 @@ void script_call_sym(s7_pointer sym)
 
 void script_call_sym_args(s7_pointer sym, s7_pointer args)
 {
-    s7_call(s7, sym, args);
+    s7_call(s7, sym, s7_cons(s7, args, s7_nil(s7)));
 }
 
 int script_has_sym(s7_pointer sym) {
diff --git a/source/scripts/engine.scm b/source/scripts/engine.scm
index a848a5d..c0af8c5 100644
--- a/source/scripts/engine.scm
+++ b/source/scripts/engine.scm
@@ -73,7 +73,7 @@
 
 (define-macro (gui . expr)
     `(registertype gui
-      (let ((x 0) (y 0)) ,@expr)))
+      (let ((pos #(0 0))) ,@expr)))
     
 (define-macro (while condition . body)
     (let ((loop (gensym)))