[mythtv-users] external channal change not working

[brad dreisbach]

just upgraded trunk this morning to 25144 and am no longer able to change the channel with
6200ch via mythbackend.  it works fine from the command line:

 [10:24am]# /usr/local/bin/6200ch -v -n 0 -4 570
starting with node: 0
node 0: vendor_id = 0x00001cfb model_id = 0x00007100
chn: 570
AV/C Command: 0570 = Op1=0x00487C20 Op2=0x00487C25 Op3=0x00487C27 Op4=0x00487C20
Sending digit 0
Sending digit 5
Sending digit 7
Sending digit 0


and here is the mythbackend log when it tries to change the channel:
2010-06-20 10:20:41.167 External channel change: /usr/local/bin/6200ch -n 0 -4 
2010-06-20 10:20:41.168 Waiting for External Tuning program to exit
2010-06-20 10:20:41.202 MythSocketThread(sock 0x165e8d0:38): socket is readable
2010-06-20 10:20:41.202 MythSocketThread(sock 0x165e8d0:38): calling m_cb->readyRead()
2010-06-20 10:20:41.202 MythSocket(165e8d0:38): UpRef: 2
2010-06-20 10:20:41.202 MythSocket(165e8d0:38): read  <- 38 21      QUERY_RECORDINGS Play
Usage: 6200ch [-v] [-s] [-n NODE] [-g GUID] [-p PORT] [-4] <channel_num>
-v        print additional verbose output
-s        use single packet method. Cannot be used with -4.
-w        toggle power state
-n NODE   node to start device scanning on (default:1)
-p PORT   port/adapter to use              (default:0)
-g GUID   GUID to use, -n switch, if present, will be ignored.
-4        Enable 4 digit channel number support. Cannot be used with -s.
2010-06-20 10:20:41.243 ret_pid(8571) child(8571) status(0x100)
2010-06-20 10:20:41.243 External Tuning program no longer running
2010-06-20 10:20:41.243 ChannelBase: external tuning program exited with error 1
2010-06-20 10:20:41.243 TVRec(1) Error: Failed to set channel to 570. Reverting to kState_None
2010-06-20 10:20:41.243 TVRec(1): Changing from RecordingOnly to None

it seems like the channel number is no longer getting passed to the external channel changer.
is anyone else having this problem?