[mythtvnz] Memory leak?

[tortise]

Hi Gurus  (I hope that's the correct plural!)
My mythbuntu 10.04 backend is misbehaving.  I've turned it right off 
(not disconnected the mains, will do that too) but the problem persists, 
which seems to be some sort of memory leak as the memory % keeps 
climbing until the box GUI becomes incredibly slow.  The 2 CPU cores now 
run at a minimum of 60%.

top gives me:
top - 23:03:51 up 35 min,  2 users,  load average: 2.34, 2.19, 1.98
Tasks: 187 total,   2 running, 185 sleeping,   0 stopped,   0 zombie
Cpu(s): 43.1%us, 14.7%sy,  0.0%ni, 41.5%id,  0.6%wa,  0.0%hi,  0.2%si, 
0.0%st
Mem:   2056708k total,  1977148k used,    79560k free,    10940k buffers
Swap:  4805624k total,      164k used,  4805460k free,  1178756k cached

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  2133 drone     20   0  370m 140m 7164 S   52  7.0  16:00.37 
gnome-system-mo
  1718 drone     20   0 23688 1096  536 S   48  0.1  15:00.28 dbus-daemon
  2135 drone     20   0  158m 2732 1816 R    7  0.1   2:11.01 
gvfs-gdu-volume
  2143 drone     20   0 55300 1668 1100 S    4  0.1   1:10.32 
gvfs-gphoto2-vo
  2145 drone     20   0 69216 1580 1072 S    4  0.1   1:09.99 
gvfs-afc-volume
  1855 drone     20   0  280m 235m 1112 S    2 11.7   0:32.17 gvfsd
  1628 root      20   0  135m  26m  11m S    1  1.3   1:33.64 Xorg
  1132 mysql     20   0  248m  29m 2960 S    0  1.4   0:05.28 mysqld
  1552 mythtv    20   0  804m  34m 6776 S    0  1.7   1:10.01 mythbackend
  1765 drone     20   0  172m 7244 4864 S    0  0.4   0:04.06 xfce4-panel
  2263 drone     20   0 19224 1472 1060 R    0  0.1   0:00.03 top
     1 root      20   0 23844 1492  696 S    0  0.1   0:00.43 init
The software is up to date and I'm running myth 0.23-fixes 26863.  I've 
not much to it so its unlikely something I've done recently.
Can anyone suggest where to from here?