Using Chromium 37 (in Ubuntu), I get these errors when trying to load VE for the first time at beta cluster:
At http://en.wikipedia.beta.wmflabs.org/wiki/Selenium_Echo_link_test_0.12753942914065586_0.12753942914065586?veaction=edit
Error loading data from server: ve-api: Revision IDs (doc=0,api=172317) returned by server do not match. Would you like to retry?
At http://en.wikipedia.beta.wmflabs.org/wiki/Sandbox?veaction=edit
Error loading data from server: ve-api: Revision IDs (doc=0,api=194405) returned by server do not match. Would you like to retry?
It was not initially reproducible in Firefox, but then I did an action=purge in the wrong window, and suddenly reproduced it.
Possibly related to T97069: On second edit attempt between loads, VisualEditor fails to load, complaining about revID mis-match