[Rpcemu] Bad opcode error involving Messenger on 5.19

I'm getting a persistent problem downloading emails using MessengerPro
v4.23 running on 0.8.10/5.19 (NetFetch v2.20b is the associated mail
fetcher in my setup), which wasn't present under 0.8.9/4.02: when I
click Transfer mail on the NetFetch panel, the downloading panel
appears as usual, displays the progress of the download and then
disappears, all as before. However, the Incoming mail field on the
MessPro Main groups panel doesn't update, and shortly afterwards
MessPro hangs. Alt-Break gives the option of stopping 'Unknown' but
quite often RPCEmu itself hangs, with the following error message:

Bad opcode 36 73697407 at 203DDEE4

Clicking OK in the error box forces a quit.

Has anyone else encountered this problem, or have any idea what the
issue might be? I'll gladly post a syslog if someone tells me how to
save it.

TIA

George

--
George Greenfield

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