I see Blank page only
1. Check your php. Minimum php5.6
2. Try to switch off twitter module
3. Switched off AcyMailing Editor
4. Check the minimal server requirements http://docs.virtuemart.net/documentation/User_Man...
5. Check you php.ini Minimal settings:
memory_limit = 128M
max_execution_time = 300
max_input_time = 360
6. Check php DOM-extentions. It must be turned on
7. Switch off Virtuemart 2 multiple customfield plugin