Bug 363820

using the clone brush to use the healing option(flattening a normal map). and every so often a pop up box error appears. box allows options to ignore or abort,first attempt to ignore,it crashed,second time to ignore,it actually continued just fine. third time i ignored the popup box it went through fine as well. 

Reproducible: Sometimes

Steps to Reproduce:
1untouched original layer(original normal map),new paint layer above the "original layer".Painting the clone brush in this paint layer.
2.clone brush settings,has healing,source point move,and clone from all visible layers,all checked on.
3.begin using clone brush to heal areas,we are painting on the paint layer above the orignial layer,after minutes into painting with clone-healing brush the pop up box should appear.

Actual Results:  
first time was not expected,but got a crash, second time 2-3 minutes in the box appeared again. no crash.3rd try box showed once more, 5 mins in, no crash.attempted to try again for the fourth time but no box has appeared....spoke too soon over 5mins in to recreate the issue while writing report and it shows the pop up box.

Expected Results:  
i only got a crash once,and that was the first time.the box showed. the other 3 times i was able to ignore and the box error went away. fourth time right now, i hit ignore,but the box comes back up every 5 seconds and will not go away when hitting ignore,only option is to abort.