Hi Gilles,
I am sorry to say we did not solve this. We found some other issues with the new VC and decided to convert our apps to ABAP WebDynpro. We had only a few productive VC apps and with the newer Business Graphics features in WebDynpro we were able to easily make good replacements. This was better for us because we have more WebDynpro developers anyway, and now we could retire the VC tool. I prefer the flexibility of direct coding in ABAP so I can't say I will miss VC very much.
I think your best approach is to try what Vasilios recommended, or the workaround I mentioned.
Good luck!
Margaret