gloomic

This bug has been fixed and uploaded. You can reinstall it.

Formulas have been supported in the latest version v1.2.2. It is easy to include a formula with Latex syntax in CSV, such as [latex]E=mc^2[/latex]. You need to install an extra plugin to support Latex, WP QuickLaTex is good one.
Filling-blank questions will be supported in the next version.

It does not support superscript and subscript yet. Formulas will be considered in future version.
It supports questions import. If you want true/false question, use single choice question instead. Blank filing questions are not supported for automatic points calculation.

The two features have been added in V1.2.
You can check the option “Anyone can respond” to allow unlogged-in users to respond when creating a new survey.

The two features will be likely added in the next version which is expected to be released next week.