this is something new since I updated from 2.2 to 2.8. (I'm running GIMP on Mac OSX 10.9, the 2.8.6p1 build from lisanet.de, Mountain Lion version)
I open IWarp, make my distortions (which are visible in the preview), then I click "OK", the "calculating" bar runs its course, and then... nothing happens!
No log entry on Console.
I haven't been able to find any report of this here or on bugzilla, so it seems it's only me?!
Thanks in advance...