diff --git a/lib/Makefile.MinGW b/lib/Makefile.MinGW
index cb933aaad..e171f08cf 100644
--- a/lib/Makefile.MinGW
+++ b/lib/Makefile.MinGW
@@ -51,7 +51,7 @@ OBJS1 = pctile.o graycode.o sort.o ssort.o \
 	extract.o fchisq65.o demod64a.o chkhist.o interleave63.o ccf2.o \
 	move.o indexx.o graycode65.o twkfreq65.o smo121.o \
 	wrapkarn.o init_rs.o encode_rs.o decode_rs.o gen65.o fil4.o \
-	flat3.o polfit.o determ.o
+	flat3.o polfit.o determ.o badmsg.o
 
 libjt9.a: $(OBJS1)
 	ar cr libjt9.a $(OBJS1) 
diff --git a/lib/Makefile.linux b/lib/Makefile.linux
index 1764b6109..164b02520 100644
--- a/lib/Makefile.linux
+++ b/lib/Makefile.linux
@@ -42,7 +42,7 @@ OBJS1 = pctile.o graycode.o sort.o ssort.o \
 	extract.o fchisq65.o demod64a.o chkhist.o interleave63.o ccf2.o \
 	move.o indexx.o graycode65.o twkfreq65.o smo121.o \
 	wrapkarn.o init_rs.o encode_rs.o decode_rs.o gen65.o fil4.o \
-	flat3.o polfit.o determ.o
+	flat3.o polfit.o determ.o badmsg.o
 
 libjt9.a: $(OBJS1)
 	ar cr libjt9.a $(OBJS1) 
diff --git a/lib/badmsg.f90 b/lib/badmsg.f90
new file mode 100644
index 000000000..30afa638b
--- /dev/null
+++ b/lib/badmsg.f90
@@ -0,0 +1,18 @@
+logical function badmsg(msg)
+  character*22 msg
+  character*42 c
+  data c/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ +-./?'/
+
+  do i=1,22
+     do j=1,42
+        if(msg(i:i).eq.c(j:j)) go to 10
+     enddo
+     badmsg=.true.
+     return
+10   continue
+  enddo
+  badmsg=.false.
+
+  return
+end function badmsg
+
diff --git a/lib/extract.F90 b/lib/extract.F90
index 2b580f63e..6768cbf4c 100644
--- a/lib/extract.F90
+++ b/lib/extract.F90
@@ -4,7 +4,7 @@ subroutine extract(s3,nadd,ncount,nhist,decoded,ltext,nbmkv)
   character decoded*22
   integer era(51),dat4(12),indx(64)
   integer mrsym(63),mr2sym(63),mrprob(63),mr2prob(63)
-  logical nokv,ltext
+  logical nokv,ltext,badmsg
   data nokv/.false./,nsec1/0/
   save
 
@@ -81,9 +81,9 @@ subroutine extract(s3,nadd,ncount,nhist,decoded,ltext,nbmkv)
 #endif
   call timer('kvasd   ',1)
   if(iret.ne.0) then
-     if(.not.nokv) write(*,1000) 
-1000 format('Error in KV decoder, or no KV decoder present.')
-     nokv=.true.
+     if(.not.nokv) write(*,1000) iret
+1000 format('Error in KV decoder, or no KV decoder present.',i12)
+!     nokv=.true.
      go to 900
   endif
 
@@ -93,6 +93,10 @@ subroutine extract(s3,nadd,ncount,nhist,decoded,ltext,nbmkv)
   ltext=.false.
   if(ncount.ge.0) then
      call unpackmsg(dat4,decoded)     !Unpack the user message
+     if(badmsg(decoded)) then
+        ncount=-1
+        go to 900
+     endif
      if(iand(dat4(10),8).ne.0) ltext=.true.
      nbmkv=2
   endif
diff --git a/lib/unpackcall.f90 b/lib/unpackcall.f90
index f738926ca..d047114d3 100644
--- a/lib/unpackcall.f90
+++ b/lib/unpackcall.f90
@@ -9,7 +9,7 @@ subroutine unpackcall(ncall,word,iv2,psfx)
   iv2=0
   if(n.ge.262177560) go to 20
   word='......'
-  if(n.ge.262177560) go to 999            !Plain text message ...
+!  if(n.ge.262177560) go to 999            !Plain text message ...
   i=mod(n,27)+11
   word(6:6)=c(i:i)
   n=n/27
@@ -37,7 +37,7 @@ subroutine unpackcall(ncall,word,iv2,psfx)
 20 if(n.ge.267796946) go to 999
 
 ! We have a JT65v2 message
-  if((n.ge.262178563) .and. (n.le.264002071)) Then
+  if((n.ge.262178563) .and. (n.le.264002071)) then
 ! CQ with prefix
      iv2=1
      n=n-262178563
@@ -52,9 +52,8 @@ subroutine unpackcall(ncall,word,iv2,psfx)
      n=n/37
      i=n+1
      psfx(1:1)=c(i:i)
-  endif
 
-  if((n.ge.264002072) .and. (n.le.265825580)) Then
+  else if((n.ge.264002072) .and. (n.le.265825580)) then
 ! QRZ with prefix
      iv2=2
      n=n-264002072
@@ -69,9 +68,8 @@ subroutine unpackcall(ncall,word,iv2,psfx)
      n=n/37
      i=n+1
      psfx(1:1)=c(i:i)
-  endif
 
-  if((n.ge.265825581) .and. (n.le.267649089)) Then
+  else if((n.ge.265825581) .and. (n.le.267649089)) then
 ! DE with prefix
      iv2=3
      n=n-265825581
@@ -86,9 +84,8 @@ subroutine unpackcall(ncall,word,iv2,psfx)
      n=n/37
      i=n+1
      psfx(1:1)=c(i:i)
-  endif
 
-  if((n.ge.267649090) .and. (n.le.267698374)) Then
+  else if((n.ge.267649090) .and. (n.le.267698374)) then
 ! CQ with suffix
      iv2=4
      n=n-267649090
@@ -100,9 +97,8 @@ subroutine unpackcall(ncall,word,iv2,psfx)
      n=n/37
      i=n+1
      psfx(1:1)=c(i:i)
-  endif
 
-  if((n.ge.267698375) .and. (n.le.267747659)) Then
+  else if((n.ge.267698375) .and. (n.le.267747659)) then
 ! QRZ with suffix
      iv2=5
      n=n-267698375
@@ -114,9 +110,8 @@ subroutine unpackcall(ncall,word,iv2,psfx)
      n=n/37
      i=n+1
      psfx(1:1)=c(i:i)
-  endif
 
-  if((n.ge.267747660) .and. (n.le.267796944)) Then
+  else if((n.ge.267747660) .and. (n.le.267796944)) then
 ! DE with suffix
      iv2=6
      n=n-267747660
@@ -128,12 +123,15 @@ subroutine unpackcall(ncall,word,iv2,psfx)
      n=n/37
      i=n+1
      psfx(1:1)=c(i:i)
-  endif
 
-  if(n.eq.267796945) Then
+  else if(n.eq.267796945) then
 ! DE with no prefix or suffix
      iv2=7
      psfx = '    '
+  else
+     iv2=8
+     word='            '
+     psfx='    '
   endif
 
 999 if(word(1:3).eq.'3D0') word='3DA0'//word(4:)
diff --git a/lib/unpackmsg.f90 b/lib/unpackmsg.f90
index aca7cfc6b..531bb300a 100644
--- a/lib/unpackmsg.f90
+++ b/lib/unpackmsg.f90
@@ -52,6 +52,7 @@ subroutine unpackmsg(dat,msg)
      if(iv2.eq.5) msg='QRZ '//c2(:n2)//'/'//psfx(:n1)//' '//grid
      if(iv2.eq.6) msg='DE '//c2(:n2)//'/'//psfx(:n1)//' '//grid
      if(iv2.eq.7) msg='DE '//c2(:n2)//' '//grid
+     if(iv2.eq.8) msg=' '
      go to 100
   else
      
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 276121419..83f95035d 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1,4 +1,4 @@
-//------------------------------------------------------------ MainWindow
+//----------------------------------------------------------- MainWindow
 #include "mainwindow.h"
 #include "ui_mainwindow.h"