If your library data has changed, then those parts in the harness design will need updating (first File->Refresh->Library Parts, then Action->Update->Batch update library parts).
As for the missing table (the one you hid using the action CTRL+H), you should be able to select the harness diagram from the project browser, then from the context menu select "Apply Style" there you have the option to update the border symbol (you can de-select update of decorations on the diagram, so a simple reselect border symbol should solve your problem).
Let me know how you get on,
Thanks Nuri. I had similar issues with two different Harness designs.
The smaller Harness design brings the table back using the methods you have mentioned. (Although, I had to include "decorations..." , just ticking "...border symbol" did not bring it back).
(Because I have used the "ACTIONS>PROCESSING>Select Cavity components" option when trying to get the table to update with correct supplier). I now have terminals and plugs included in the BOM table(which we do not want), this was partially corrected by using "Cavity Component Management" and deselecting them, but there are 4 items that refuse to be removed. For the sake of testing, I added supplier info to these four components, which currently shows up as the default blank "-". The supplier info did not come through to the table when following the methods to update the table info.
The second design is much larger, but the methods do not bring the BOM table back from being hidden.
I have redrawn both schematics, so I will avoid updating components while drawing a harness. This is quite inconvenient, as we are currently in the process of switching over to Vesys and are actively updating and adding components to our Library.