These days I'm facing a grave problem concerning my 10.3 Toolbox. Any time I want to open and run a tool the tool icon changes, displaying a red x / a red cross covering the tiny hammer. Nothing else happens, no error window, nothing. The batch tools are able to open though, but not working. I own an academic EVA-1-year-trial-key.
Things I tried so far without any success: deauthorisation, repair process, completely new installation, renaming registry ArcToolbox-/ESRI-folder, checked MSXMLx.dll, new license key, new Windows-Profile
What else should I do? I would prefer not to restore my OS.
Greetings from Franconia
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My system config: Windows 7 Home Premium 64-Bit, ArcGIS 10.3