Rein, I applied the new files to both server and client and it has resolved the issues as far as I can see. I did a short distance/low power test (with powerline QRM) and got excellent results. I now get 20cps for uncompressed text files and 16cps for binary files. No repeats both for file transfers and for short command too. In fact I didn't notice any repeats at all during the exchanges. So to me it is an issue resolved. Thanks again. 73s, John