Hi jogrady, I'm sorry but you are receiving some validation errors that are not completely clear (it's my fault). In the next days I will release a new version that completes validation messages. Anyway, if you want to get it work:
1) at first create your style
this is the standard rules I setup at the moment:
> border size has to be <= 10
> border radius has to be <= 20
> box radius has to be <= 20
2) then create your gallery
Let me know if this rules are too restrictive for your website.
If you're confidential with php developing you can look at the class SygValidate.php (method validateStyle) to change temporary your rules.
Waiting for your feedback, Luca
* please, after resolution of this issue spend one moment to vote for the plugin, thank you