Stopped working correctly with Gravity Forms plugin

I’ve been using this plugin, with Gravity Forms, to allow users to fill out a form and upload a simple log file (filename.log). It’s been working great, but something broke within the last few months, and now these plain text files named filename.log are no longer able to be uploaded.

I’ve tried checking the 3 checkboxes, separately and together, with no success:

__ Check only file extensions: to be used only if you are unable to upload files you have enabled by selecting their type

__ Skip WordPress checks: to be used only if you want to manage all the file types by yourself, skipping internal WordPress lists and checks

__ Enable workaround for GravityForms: override standard behaviour – Beta version – WP-Extra-File-Types has been developed to integrate only with WordPress Media Library

Any other ideas or suggestions, to allow users to fill out a form and attach a small text file named filename.log?

– Scott