I just joined the list and was having the same problem with an RTC4
card. I think it was caused by the program not having read permission
for the correction and firmware files. I put copies in the OpenAPC
directory (which required administrator access on Win 7) and now
everything is working fine. I also put a copy of the rtcdll.dll file
there just for good measure though I don't know if that was necessary.
Kevin Criqui