...
clear your browser's cache (click here see Clear your web browser's cache, cookies, and history for help),
try a different browser,
try accessing XTM Cloud in a private window (“Incognito”),
run your browser without plugins or extensions (click here see Disabling plugins for help),
check if your internet connection is stable,
check your proxy and firewall settings,
work in single browser mode.
...
Exact date and time range when the issue occurred,
XTM Workbench instance ID (click here (see How to obtain XTM Workbench URL (XTM Workbench instance ID) for help),
Name of the project and of the file you were working on when the issue,
Name of the user who is experiencing this problem.
...