Mirror-timeout when sending too many commands ...
The mirror-driver can only set channel-values so fast, so the "SetChannel"-message-que piles up as you try to set channels too fast in the open-loop-mode. As a consequence, the mirror needs longer to set all the values than the timeout counter waits at some point.
possible solutions: Check the que for messages that contain the channels that are to be set. Only apply the last commands in the driver. Reque all other messages in the correct order after doing so. Alternatively: Disable all offset-controls in the GUI until all expectations are fullfilled. This might be the better solution, even if it is less general.