Glad to hear that the issue was resolved.
If you see the warning about wp_cron persisting, then you can set up manual cron triggering (ask me how to do this if you are not sure how). If on the other hand you only saw the error once, you can ignore it.
If you have already set up manual cron triggering and you still see this error, this means that the cron job runs but does not complete. I would need to see the verbose debug output to determine where the job fails.
with regards