LP#242852 comment 19 seems to say that real_transparency is causing the issue.

Re-pushing the code removed in rev 398
* added an new conf parameter (enable_real_transparency defaulting to True) so real_transparency can be disabled
* This should be enough to push the release :)

doc/terminator_config.5

@@ -15,6 +15,10 @@ The options can be defined one per line in the form: \fBOPTION = VALUE\fR.
 If true, allow applications in the terminal to make text boldface.
 Default value: \fBTrue\fR
 .TP
+.B enable_real_transparency\fR (boolean)
+If true, terminator will try to usereal transparency if possible.
+Default value: \fBTrue\fR
+.TP
 .B silent_bell\fR (boolean)
 If true, don't make a noise when applications send the escape sequence for the terminal bell. Flash the terminal instead.
 Default value: \fBTrue\fR

terminatorlib/config.py

@@ -128,6 +128,7 @@ class TerminatorConfValuestore:
     'cycle_term_tab'        : True,
     'copy_on_selection'     : False,
     'close_button_on_tab'   : True,
+    'enable_real_transparency'  : True,
   }
 
   def __getattr__ (self, keyname):

terminatorlib/terminator.py

@@ -160,6 +160,17 @@ class Terminator:
     if borderless or self.conf.borderless:
       self.window.set_decorated (False)
 
+    # Set RGBA colormap if possible so VTE can use real alpha
+    # channels for transparency.
+    #TODO maybe it work in every case
+    # LP#242852 real transparency causes graphical glitches,
+    # real transparency can be disabled in ~/.config/terminator/config
+    if self.conf.enable_real_transparency:
+      screen = self.window.get_screen()
+      colormap = screen.get_rgba_colormap()
+      if colormap:
+        self.window.set_colormap(colormap)
+
     # Start out with just one terminal
     # FIXME: This should be really be decided from some kind of profile
     term = (TerminatorTerm (self, self.profile, self.command))