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pylon Viewer in pylon4linux 2.3.3 may have problems at starting up

In pylon4linux 2.3.3 you may happen to get the following error message while trying to run the pylon viewer (or the SpeedOMeter), although the environment variables PYLON_ROOT and GENICAM_ROOT_V2_1 and the LD_LIBRARY_PATH were correctly exported:

"PylonViewerApp: symbol lookup error: /usr/lib/libQtNetwork.so.4:

undefined symbol: _ZN14QObjectPribate15checkWindowRoleEv"

In this case it seems some of the Qt libraries, i.e. libQtNetwork, were loaded from "/usr/lib" while other Qt libraries were still loaded from the local pylon folder "pylon/bin".

However, due to a mismatch of the different Qt versions, the pylon viewer will fail to start.

In order to fix the problem, you have to remove (e.g. save them as a backup in a folder on the desktop or delete them permanently) all local Qt libraries and their correspondent links that pylon viewer uses, which are placed in "pylon/bin".

The libraries and links (totally 16) that should be removed are:

libQtCore*

libQtGui*

libQtNetwork*

libQtXml*