@maxben … I tested using a h9combo so similar to yours (basically same image) - the wifi initialisation on this box is really, really slow, so between pressing OK to change the MAC and the final finished message is at least 90 seconds if not longer….so thats why I asked about the 2 messages, as it doesn‘t stop you changing menu.s while its doing the change.
The error is not in the changed code but in plugin initialisation.
ANyway will test again tomorrow!