This issue has been addressed by the following change by Tom94:
Fix raw input mouse clamping being unnecessarily enforced when raw input is not controlling the cursor, causing issues with editor menus.
It will be applied to builds newer than b20150108.3cuttingedge.
Please follow up in this thread on the status of this issue after you have tested it. If it has not yet been resolved, please provide any new details that may have arisen since before this change.
Fix raw input mouse clamping being unnecessarily enforced when raw input is not controlling the cursor, causing issues with editor menus.
It will be applied to builds newer than b20150108.3cuttingedge.
Please follow up in this thread on the status of this issue after you have tested it. If it has not yet been resolved, please provide any new details that may have arisen since before this change.