Groovy Editor Ignores Tab And Indentation Settings

While using the Groovy editor on a .groovy file, automatic indentation seems to be disabled. Opening a curly brace and hitting enter results in the cursor starting at the very beginning of the next line, and no closing curly brace is generated.

Pressing the tab button on a new line does not cause any indentation. Pressing the tab button AFTER typing a new line gives the expected behavior.

Highlighting a block of code and pressing CTRL-I, or right-clicking and going Source->Indent has no effect on the code.

Issue occurs with imported project files, new files added to imported project, and new files created in non-imported project

Opening the same file with the Java editor gives the expected behavior