Our 9.3.4 release fixed this issue, which seemed to be one of the problems you might have been facing:
Inline CSS is not applied to theme while it’s in the theme composer
Hopefully that could clear things up for you.
As a reminder, Salesforce does NOT allow reverting back to prior versions of managed packages. Skuid always recommends installing new versions in a non-business critical sandbox environment to test all mission critical functionality before installing into a production environment. We also recommend that you update out of date themes when you upgrade.
