Haven't used LR in many months. I just noticed that previously loaded plug ins such as PS CS6, NIK's software group of plug ins including Silver Ex Pro and DxO Viewpoint 2.5 are not there any more. I've re-downloaded and reinstalled the DxO twice but it doesn't show up via the "export as preset" function or plug in extras. In addition, if I select plug in manager and click on the "add" function. I can navigate to the various programs but they are "greyed" out and cannot be selected.
I'm on the latest Mac Mini, running Mountain Lion and have both LR4 and LR5 loaded on but only LR5 open.