Did you do the slot monitor test mentioned above?
You did not actually mention which DCC system you are using. From one of your replies, seems to be a Digitraxx system.
Clearing the slots with Slot monitor (or Op switches) can fix lots of issues.
?
One way to find the exact cause:
1, do the reset.
2, do write full sheet for each tab, testing after each tab.
You can then tell which tab has the bad CV setting.
If it is the basic page with long and short addresses, then the CS may be the issue (Slots).
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Thomas
DeSoto, TX