diff -up cups-1.3.7/backend/runloop.c.str3001-str3622 cups-1.3.7/backend/runloop.c
--- cups-1.3.7/backend/runloop.c.str3001-str3622	2008-01-09 20:00:02.000000000 +0100
+++ cups-1.3.7/backend/runloop.c	2010-08-17 14:44:56.000000000 +0200
@@ -265,6 +265,14 @@ backendRunLoop(
 	        CUPS_LLCAST bc_bytes);
         cupsBackChannelWrite(bc_buffer, bc_bytes, 1.0);
       }
+      else if (bc_bytes < 0 && errno != EAGAIN && errno != EINTR)
+      {
+        fprintf(stderr, "DEBUG: Error reading back-channel data: %s\n",
+	        strerror(errno));
+	use_bc = 0;
+      }
+      else if (bc_bytes == 0)
+	use_bc = 0;
     }
 
    /*