"Add Functionality" Tab Gone

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When I hit the "Add Functionality" tab the page goes completely empty. No source code. No nothing. I tried to refresh the /install page but it didn't work. I just upgraded to 5.4.1. I'm pretty sure it was working prior to this but I'm not sure. Any thoughts?

Thanks
Simon

coolrebel
 
Mnkras replied on at Permalink Reply
Mnkras
there may have been a problem during the upgrade, re-upload the concrete folder (look in the updates folder first to overwrite)