Yes, ksmith, this is a known issue with DL05/H0-ECOM100 combination. In our tests:
(1) DL05, RUN mode, H0-ECOM100, Download ladder change: Fails about 10% of the time.
(2) DL05, PROGRAM mode, H0-ECOM100, Download ladder change: <1% (never duplicated here, but could happen)
(3) DL05, RUN mode, H0-ECOM, Download ladder change: <1% (never duplicated here, but could happen)
(4) DL05, PROGRAM mode, H0-ECOM, Download ladder change: <1% (never duplicated here, but could happen)
As you can see from our tests, the obvious "work-around" is (2), (3) or (4) until a fix can be determined. The H0-ECOM is less likely to fail.
Also, notice that when ladder changes are not being downloaded, all is stable. So you should only encounter this type of problem during development stages, and never in production (when changes are not being made).
Currently, our testing indicates a problem with the DL05 firmware. We are working with our partners, Koyo, for a fix.