Good Day Tigre,
Thanks for your post.
A) To achieve a split height facade, what I can recommend is using the 'Wainscot (Split)' wall type. Could you please try this and let me know how it goes for you?
B) To resolve this issue, please refer to the following steps:
1. Please go to Extensions > PlusSpec > Settings > Dialog Units to 'Use model default' > Submit
2. Then would you be able to go Window > Model Info > Units > Switch Format to Decimal and then select your preference.
3. Final step is to restoring factory default by clicking on Extensions > PlusSpec > Restore Factory Default > then clicking ok.
Would you be able to update me on how you go in relation to this?