I have a bit of a problem... The plugin was working perfectly fine for a bit, but then I must've either pressed some quick key accidentally or inadvertently changed an unknown setting, because suddenly now the grass isn't showing up; no preview, no end result, nothing.

I've moved a bunch of sliders trying to get it back, to no avail. The 'show preview' option is checked. I'm pretty sure it's not making the grass at all, since, when it does my slow pc will slightly lag, (this is aside from the fact that pressing 'Make Fur' does nothing) and now it shows no difference.
What the heck is happening?! I've tried changing many of the options in the dialog box... but nothing changes.

This was working perfectly fine, and is a wonderful plugin. I really could use help.
Thank you!