Visoglide sliding door rainwater leak problem 

Smart Visolglide looks to me like a great system. But any sliding door that's wrongly installed can result in hard-to-diagnose damage by rain ingress. This is one such installation where remedial action was successful. This video shows some steps in the diagnosis and remediation of a failed system in in exposed position. If this is helpful please like the video and/or comment. If there's much demand I'll add more detail on some areas of possible leak that you might want to look at if you are trying to diagnose leaks on a similar installation. NB I didn't install this system, and I am not a trained Visoglide installer. Good luck!