If its a bug its the first time I've heard of it. Can you select the customer in the Customer Center and take a screen shot of that window with the transactions tab selected? it should show "There are no transactions of the type "All Transactions", filtered by "Show All", win date range "All Dates".
There are no sub-jobs below the customer/job?
Some of the other things you mention sound like data damage - something that might be caused by a duplicate name somehow having been created (the software prevents that but it could be a bug). The inability to merge is what makes me wonder.
Also is this a job or a customer? If its a job try moving it to the top level first in the customer center (where it is not longer a child of a customer). Does that work? If it doesn't there's some issue with the data and we can work from there. If it does work try deleting it after.
Reply to me and I'll try to help.
