One of the most important objectives within Esri BeLux is providing an efficient and high quality technical support. You can contact the Esri BeLux Support Team in two different ways:
Phone (business hours)(Dutch): +32 (0)2 461 37 32
Phone (business hours)(French): +32 (0)2 461 37 33
Please provide us with the following information when contacting us:
• Name and organization
• Configuration of your system (operating system, hardware configuration)
• Software version (e.g. ArcGIS 10.0)
• License (ArcView, ArcEditor, ArcInfo)
• License type (Single or Concurrent use)
• Clear explanation of the issue
• Steps to reproduce the issue
• Data on which the issue occurs (if applicable)
• Screenshots of the errors that arise
Upgrade your software to 10.5.1 now.
You can always have a look at the online help pages, blogs and forums of Esri at http://resources.arcgis.com/.