We are having the same problem here in our office. It has happened on two different computers, but only with the same project (that I know of.) This project was started in AC10, then when our office got AC11 we opened it in AC11.
We first noticed the sink printing problem on "Computer 1." At the time, we had just loaded AC11 on Computer 1, and AC11 would crash often. After reinstalling AC11 and upgrading to hotfix 1040, the problem was solved (or so we thought.)
This morning someone else opened the same model on "Computer 2." Once again the sinks shows on the model and in PlotMaker, but *some* of the sinks are missing the basin on printouts. Computer 2 has been using AC11 on many projects, and it's working fine. Computer 2 is also running hotfix 1040.
We first tried unloading the AC10 library and loaded the AC11 library and 10 subset. This did not fix the problem.
We noticed that when printing or using the Amuni PDF converter, the sinks do not appear. When doing File>Save As...>PDF, the sinks appear in the PDF. From here it is possible to print the PDF using Acrobat and the sinks show correctly.
The PDF is a workaround, but does anyone know how to fix this? We're stumped. 😕