I just saved my edit on this page: https://en.wikipedia.org/w/index.php?title=User:RYasmeen_%28WMF%29/sandbox&veaction=edit
and Tried to re-open VE got the following error:
Error loading data from server: ve-api: Revision IDs (doc=658877976,api=658878557) returned by server do not match. Would you like to retry?