Let me know if you still have any issues with the TBB. Creating plug-in object styles allows you to create plug-in objects, such as the title block border, with a combination of parameters that are determined by the style or by instance. If you have placed the TBB instances while the graphics were By Style, they would not have changed when you have made the graphics By Instance. Click Title Block Border Settings from the Object Info palette of a selected title block border to open the Title Block Border Settings dialog box. My assumption of it disappearing is that at some point you have made the graphics to be By Instance by editing the style and then you have started placing the TBB instances. So, if you edit the style and click on the button left from Title Block Graphics in the Title Block pane you will see that the Title Block will appear in all objects using that style. When you create new TBB using that style and the TBB Tool, it is simply not getting the Title Block graphics as it is not set to By Style. This means that each of the TBB objects using that style will not be using its Title Block graphics. as long you do some operation on the title block it will appear again.Just imagine if i have hundreds of sheets. Goes well too is you double click title block for editting, move by nudge etc. In your file you have edited the TBB Style and made the TBB graphics to be By Instance. Once i close and reopen my files title block is not visible, only the borders are.What i did was select the title block and move 0,0 and it will appear again. Hello will write here so that others that might be having the same problem could follow the discussion.