Once there is a reply to the original post, it cannot be edited. That happens with comments also.
Some things you could try:
Turn off conversations. Menu > View > Conversations.
If the sync interval is too small, it could be the cause. Menu > Tools > Settings > General > Synchronization.
Conversations is disabled. And was before this mornings delete and account reinstall.
I just Uninstalled and reinstalled emClient, same behavior. There may be a better method for doing a clean-install, since the reinstall acquired the account I had setup in the original version. This is not the gift I wanted.