Mark,
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Yep, that's a bug.?? I just confirmed it here.? There is some kind of length calculation issue in the code dealing with the command image received.?? For now, you can use a workaround.? Just type a blank after the ACT in the command and it will work.? For example,
SMSG XNET V 500 ACTb
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Where the 'b' is a blank? (Physically type the blank, because the VM command line is nulls not blanks.
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I'll get a fix to you soon.
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Regards,
Bob