visualizers stopped working in VS 2013 debugger

Hi,

I am using QT (a C++ GUI toolkit) and have the following problem. QT provides visualizers to help debug its classes. However every once in a while the debug information is gone and a simple enum value is shown in the debugger. Something like:

In the autos window: 

• Name: eventID, Value: QString (10), type: QString
• Name: jobList, Value: QStringList (11), type: QStringList

All standard types (enums, doubles, integers...) are readable.

Some facts:

• My solution consists of several projects; each project results in a DLL; the DLLs are loaded by a main.
• A rebuild does not solve the problem,
• A build does not solve the problem,
• A clean does not solve the problem
• In the same call stack (during the same debug session) the visualizer works in other projects, but not in all
• All developers in my company have the same problem

I have tried this post. The visualizers there seem to have stopped working altogether and not for a short period of time.

Thanks in advance,

ms-kootje