Problem with tcpdump filters

[Alaios]

Hi... I face a problem with the argus and the filter
that i need to apply...
The following command 
tcpdump -i eth4 -vv ip[1]==0x28 with the filter works
fine..
The problem is that i cannot apply it to argus...
argus -d -M 0.01 -S 0.01 -i $1   -w my-AF1 ip[1]==0x28
returns no packet...

I think that the problem is argus-oriented.. because
the ra give me packets but ends with a no data seen
message

e.x
....
skipped a bunch of lines



04-12-21 16:41:04.496108        0.200060          man 
pkts       604  bytes       629368  drops     0  flows
   3         closed       0           CON
04-12-21 16:41:04.696168        0.200053          man 
pkts       714  bytes       743988  drops     0  flows
   3         closed       0           CON

No data seen.

Plz suggest me something as fast a u can


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