Same behaviour here.
CQ DE OE1TKW , K and W doubly sent.
checked with two remote RRCS ( one for K3, one for FT-2000)
when sending,
the chars CQ DE OE1T turn white immediately, sending begins, ( sent chars turning black )
during transmission K and W individually turn white ,
and these are sent twice.
( what does the white colour mean?)
if the string is longer, all chars after "CQ DE OE1T" are sent twice.
I believe some buffer problem within the PC client.
OS is Windows Vista.
Will debug as described in the thread.
73
Helmut, OE1TKW