Top right, kind of in the middle. You should cover it over with a normal brush and then blur or smear it. When I get on my PC I could save the picture of the hightmap and test it myself. Maybe it's something else, but I'm not sure.
Ok! Thats what I thought. I'll go give it a try.
*Edit
Ok, I tried to blot out the entire crater looking thing in a plain white brush, and it didn't work. Could it be that little black dot I planned on putting an easteregg in?
*Edit again
Ok, its not that either. I guess its a good idea to give you the crash message as well! Here it is:
Application Name: FeralHeart.exe
Application Version: 0.0.0.0
Application Timestamp: 4efb3f02
Fault Module Name: libstdc++-6.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4bc96cae
Exception Code: 40000015
Exception Offset: 0001bd1d
OS Version: 6.3.9600.2.0.0.768.101
Locale ID: 1033
Additional Information 1: a179
Additional Information 2: a1790118ecadf32075ab49fd62d63ffd
Additional Information 3: 7bac
Additional Information 4: 7bac3c77a7c840082a7bb26843e68c48
Also, to add to that, the lake area at the bottom right isn't the issue either