John,I don't know what you were using but I found a program called abc2tab.
The program seems to be fussy but I have had some success (producing output - I don't know how accurate it is) as well as failures I can't explain.
I have just been using the command line:
abc2tab -m [abcfilename]
As I've had 1/2 hr to spare, I have put up an example at http://www.folkinfo.org/abctest/mandotest.htm which you may like to look at.
Bear in mind it is a hack together job and the output will be the last successful conversion which need not be the abc entered. Also, a tune must start X: 1 as abc2tab uses the Xref to produce the name of the output file and I can't be bothered extracting that for a test.
Sorry about my post above - it was an accident - I've got several browsers open here and hit the wrong key. That is abc that seems to convert ok though.
Jon