diff --git a/map65/commons.h b/map65/commons.h
index c74787c35..f7ea43d9e 100644
--- a/map65/commons.h
+++ b/map65/commons.h
@@ -40,6 +40,8 @@ extern struct {                     //This is "common/datcom/..." in Fortran
   char hiscall[12];
   char hisgrid[6];
   char datetime[20];
+  int junk1;                        //Used to test extent of copy to shared memory
+  int junk2;
 } datcom_;
 }
 
diff --git a/map65/libm65/m65.f90 b/map65/libm65/m65.f90
index 6362c9b5e..d3bd327e4 100644
--- a/map65/libm65/m65.f90
+++ b/map65/libm65/m65.f90
@@ -26,6 +26,7 @@ program m65
   use timer_module, only: timer
   use timer_impl, only: init_timer, fini_timer
 
+  include 'njunk.f90'
   parameter (NFFT=32768)
   parameter (NSMAX=60*96000)
   parameter (NREAD=2048)
@@ -36,7 +37,7 @@ program m65
   real*8 fc0,fcenter
   character*80 arg,infile
   character mycall*12,hiscall*12,mygrid*6,hisgrid*6,datetime*20
-  common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fc0,nutc0,junk(38)
+  common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fc0,nutc0,junk(NJUNK)
   common/npar/fcenter,nutc,idphi,mousedf,mousefqso,nagain,                &
        ndepth,ndiskdat,neme,newdat,nfa,nfb,nfcal,nfshift,                 &
        mcall3,nkeep,ntol,nxant,nrxlog,nfsample,nxpol,nmode,               &
diff --git a/map65/libm65/m65a.f90 b/map65/libm65/m65a.f90
index ddf48bce9..bb8b3cdc6 100644
--- a/map65/libm65/m65a.f90
+++ b/map65/libm65/m65a.f90
@@ -70,9 +70,11 @@ subroutine m65b(m65com,nbytes)
 end subroutine m65b
 
 subroutine m65c(dd,ss,savg,nparams0)
+
+  include 'njunk.f90'
   real*4 dd(4,5760000),ss(4,322,32768),savg(4,32768)
   real*8 fcenter
-  integer nparams0(41),nparams(41)
+  integer nparams0(NJUNK+2),nparams(NJUNK+2)
   logical ldecoded
   character*12 mycall,hiscall
   character*6 mygrid,hisgrid
@@ -80,7 +82,8 @@ subroutine m65c(dd,ss,savg,nparams0)
   common/npar/fcenter,nutc,idphi,mousedf,mousefqso,nagain,              &
        ndepth,ndiskdat,neme,newdat,nfa,nfb,nfcal,nfshift,               &
        mcall3,nkeep,ntol,nxant,nrxlog,nfsample,nxpol,nmode,             &
-       nfast,nsave,max_drift,nhsym,mycall,mygrid,hiscall,hisgrid,datetime
+       nfast,nsave,max_drift,nhsym,mycall,mygrid,hiscall,hisgrid,       &
+       datetime,junk1,junk2
   common/early/nhsym1,nhsym2,ldecoded(32768)
   equivalence (nparams,fcenter)
   
diff --git a/map65/libm65/njunk.f90 b/map65/libm65/njunk.f90
new file mode 100644
index 000000000..319fb5ab7
--- /dev/null
+++ b/map65/libm65/njunk.f90
@@ -0,0 +1 @@
+  parameter(NJUNK=40)
diff --git a/map65/libm65/recvpkt.f90 b/map65/libm65/recvpkt.f90
index 085b9c05e..88d51cc59 100644
--- a/map65/libm65/recvpkt.f90
+++ b/map65/libm65/recvpkt.f90
@@ -2,6 +2,7 @@ subroutine recvpkt(nsam,nblock2,userx_no,k,buf4,buf8,buf16)
 
 ! Reformat timf2 data from Linrad and stuff data into r*4 array dd().
 
+  include 'njunk.f90'
   parameter (NSMAX=60*96000)          !Total sample intervals per minute
   parameter (NFFT=32768)
   integer*1 userx_no
@@ -11,7 +12,8 @@ subroutine recvpkt(nsam,nblock2,userx_no,k,buf4,buf8,buf16)
   integer*2 jd(4),kd(2),nblock2
   real*4 xd(4),yd(2)
   real*8 fcenter
-  common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fcenter,nutc,junk(38)
+  common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fcenter,nutc,  &
+       junk(NJUNK)
   equivalence (kd,d4)
   equivalence (jd,d8,yd)
   equivalence (xd,c16)
diff --git a/map65/libm65/symspec.f90 b/map65/libm65/symspec.f90
index 2c21940f9..e4160cfd1 100644
--- a/map65/libm65/symspec.f90
+++ b/map65/libm65/symspec.f90
@@ -18,11 +18,13 @@ subroutine symspec(k,nxpol,ndiskdat,nb,nbslider,idphi,nfsample,    &
 !  ihsym    index number of this half-symbol (1-322)
 !  nzap     number of samples zero'ed by noise blanker
 
+  include 'njunk.f90'
   parameter (NSMAX=60*96000)          !Total sample intervals per minute
   parameter (NFFT=32768)              !Length of FFTs
   real*8 ts,hsym
   real*8 fcenter
-  common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fcenter,nutc,junk(38)
+  common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fcenter,nutc,  &
+       junk(NJUNK)
   real*4 ssz5a(NFFT),w(NFFT),w2a(NFFT),w2b(NFFT)
   complex z,zfac
   complex zsumx,zsumy
diff --git a/map65/mainwindow.cpp b/map65/mainwindow.cpp
index ddd1a3a3d..ec63e2b94 100644
--- a/map65/mainwindow.cpp
+++ b/map65/mainwindow.cpp
@@ -1319,7 +1319,9 @@ void MainWindow::decode()                                       //decode()
   memcpy(datcom_.mygrid, mgrid.toLatin1(), 6);
   memcpy(datcom_.hiscall, hcall.toLatin1(), 12);
   memcpy(datcom_.hisgrid, hgrid.toLatin1(), 6);
-//  memcpy(datcom_.datetime, m_dateTime.toLatin1(), 17);    //This causes problems!!!  Why???
+  memcpy(datcom_.datetime, m_dateTime.toLatin1(), 17);
+  datcom_.junk1=1234;
+  datcom_.junk2=5678;
 
   //newdat=1  ==> this is new data, must do the big FFT
   //nagain=1  ==> decode only at fQSO +/- Tol
@@ -1333,7 +1335,7 @@ void MainWindow::decode()                                       //decode()
     from += noffset;
     size -= noffset;
   }
-  memcpy(to, from, qMin(mem_m65.size(), size));
+  memcpy(to, from, qMin(mem_m65.size(), size-8));
   datcom_.nagain=0;
   datcom_.ndiskdat=0;
   m_call3Modified=false;