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Alright, it seems nobody cares. Here's a patch that solves the problem for me.
I don't know what side effects are caused by this (I'm new to the code). However. It works for me.

Index: player.cc
===================================================================
RCS file: /cvsroot/vomp/client/player.cc,v
retrieving revision 1.63
diff -u -r1.63 player.cc
--- player.cc   15 Aug 2007 20:51:51 -0000      1.63
+++ player.cc   19 Aug 2007 07:28:53 -0000
@@ -182,10 +182,8 @@
   if (state == S_PLAY) return;
   lock();

-  bool doUnlock = false;
-  if (state == S_PAUSE_P) doUnlock = true;
   switchState(S_PLAY);
-  if (doUnlock) unLock();
+  unLock();
}

Hi all,

I have a problem with some channels that seem to send no data or corrupted data (e.g. scrambled channels).

If i switch to such a channel the screen keeps black (nothing unusual till now) but if i try to change the channel or press 'exit/back' the system freezes (well not the whole system, but the application).

Here is the debug log:

15:25:20.483547 [debug]  34 Remote - Button 37
15:25:20.484387 [debug]  34 Box - Construct, now 8
15:25:20.485152 [debug]  34 View - Construct 0x1018b028, now 4
15:25:20.486019 [debug]  34 Box - Construct, now 9
15:25:20.627131 [debug]  34 VVideoLive - Do WSS: 1
15:25:20.819386 [debug]  34 VVideoLive - Delay starts here due to time taken by plugin to stop
15:25:20.820861 [debug]  34 VVideoLive - Delay ends here due to time taken by plugin to stop
15:25:20.822711 [debug]  34 Box - Construct, now 10
15:25:20.823493 [debug]  34 View - Construct 0x1018b308, now 5
15:25:20.824261 [debug]  34 Box - Construct, now 11
15:25:20.838609 [debug]  34 VDR - Success got to end of getChannelSchedule
15:25:20.840254 [debug]  34 Timers - Starting set timer 1
15:25:20.841221 [debug]  34 Timers - Timer set for 0x1018b360 ref 1
15:25:20.871508 [debug]  34 Timers - Starting set timer 1
15:25:20.872494 [debug]  34 Timers - Timer set for 0x1018b360 ref 2
15:25:20.888977 [debug]  34 Channel - C.51 loaded, VPid=767, numApids=2
15:25:20.889767 [debug]  34 Channel - APid 768 deu
15:25:20.890526 [debug]  34 Channel - APid 769 deu
15:25:20.891288 [debug]  34 Player - LOCKED
15:25:20.892036 [debug]  34 Player - Switch state from 6 to 1
15:25:20.895948 [debug]  34 Audio - doMuting: user=0 sys=0
15:25:20.896740 [debug]  34 Audio - MUTE OFF OFF OFF
15:25:20.897517 [debug]  34 Audio - doMuting: user=0 sys=0
15:25:20.898290 [debug]  34 Audio - MUTE OFF OFF OFF
15:25:20.909481 [debug]  34 Player - Prebuffering...
15:25:21.494566 [debug]  39 Player - Startup Audio stream chosen c0
15:25:22.112724 [debug]  39 Player - Got >500K, prebuffering complete
15:25:24.848713 [debug]  36 Timers - Timer firing for client 0x1018b360 ref 1
15:25:24.849905 [debug]  42 Timers - sending timer to 0x1018b360 with parameter 1
15:25:24.850732 [debug]  42 Command - PMFOS called
15:25:24.851600 [notice] 34 Core - Signal 23 received
15:25:24.851869 [debug]  34 Core - SIGURG caught
15:25:24.852103 [debug]  34 Command - processing message 2
15:25:24.852323 [debug]  34 Command - Sending message to viewman
15:25:24.852534 [debug]  34 ViewMan - it's for meeee!
15:25:24.867869 [debug]  34 Timers - Starting cancel timer 0x1018b360 1, list size = 3
15:25:24.869010 [debug]  34 Timers - 0x1018b360 ref 1 cancelTimer WAITING
15:25:24.869963 [debug]  42 Timers - timerEventFinished for 0x1018b360
15:25:24.870775 [debug]  42 Timers - timerEventFinished for 0x1018b360 1 - remove done
15:25:24.928711 [debug]  34 Timers - Starting cancel timer 0x1018b360 2, list size = 2
15:25:24.929032 [debug]  34 Timers - Removed timer for 0x1018b360 ref 2
15:25:24.929479 [debug]  34 Box - Destruct, now 10
15:25:24.930542 [debug]  34 View - Destruct, now 4
15:25:24.930782 [debug]  34 Box - Destruct, now 9
15:26:00.008671 [debug]  36 Timers - Timer firing for client 0x10187738 ref 1
15:26:00.010039 [debug]  43 Timers - sending timer to 0x10187738 with parameter 1
15:26:00.011737 [debug]  43 Timers - Starting set timer 1
15:26:00.012538 [debug]  43 Command - PMFOS called
15:26:00.013412 [notice] 34 Core - Signal 23 received
15:26:00.013687 [debug]  34 Core - SIGURG caught
15:26:00.013925 [debug]  34 Command - processing message 15
15:26:00.014148 [debug]  34 Command - Sending message to viewman
15:26:00.014363 [debug]  34 ViewMan - it's for meeee!
15:26:00.015194 [debug]  43 Timers - timerEventFinished for 0x10187738
15:26:00.015995 [debug]  43 Timers - timerEventFinished RESTART for 0x10187738

Now the screen is black and i press 'back/exit':

15:26:23.452309 [debug]  34 Remote - Button 31
15:27:00.008673 [debug]  36 Timers - Timer firing for client 0x10187738 ref 1
15:27:00.010067 [debug]  44 Timers - sending timer to 0x10187738 with parameter 1
15:27:00.011745 [debug]  44 Timers - Starting set timer 1
15:27:00.012531 [debug]  44 Command - PMFOS called
15:27:00.013366 [notice] 34 Core - Signal 23 received
15:27:00.013637 [debug]  34 Core - SIGURG caught
15:27:00.014396 [debug]  44 Timers - timerEventFinished for 0x10187738
15:27:00.015182 [debug]  44 Timers - timerEventFinished RESTART for 0x10187738
15:28:00.008671 [debug]  36 Timers - Timer firing for client 0x10187738 ref 1
15:28:00.010028 [debug]  45 Timers - sending timer to 0x10187738 with parameter 1
15:28:00.011722 [debug]  45 Timers - Starting set timer 1
15:28:00.012506 [debug]  45 Command - PMFOS called
15:28:00.013337 [notice] 34 Core - Signal 23 received
15:28:00.013609 [debug]  34 Core - SIGURG caught
15:28:00.014369 [debug]  45 Timers - timerEventFinished for 0x10187738
15:28:00.015153 [debug]  45 Timers - timerEventFinished RESTART for 0x10187738

The application keeps frozen.

Please let me know if i should do some tests to help to solve this problem.

Alex