Again I cannot reproduce on OS X 1.1.0 with latest nightly 1.1.0 (1.0.1 might have these problems).
# main import testImportSub find("icon.png").highlight(2) # no thumbnail ever
# testImportSub from sikuli import * "icon.png" # thumbnail is shown from beginning and opens Preview
... sure you are really using the latest sikulix.jar from nightly 1.1.0?
Again I cannot reproduce on OS X 1.1.0 with latest nightly 1.1.0 (1.0.1 might have these problems).
# main png").highlight (2) # no thumbnail ever
import testImportSub
find("icon.
# testImportSub
from sikuli import *
"icon.png" # thumbnail is shown from beginning and opens Preview
... sure you are really using the latest sikulix.jar from nightly 1.1.0?