Orthophoto tiles can be very resource intensive to use. Do you have this problem if you add or remove tiles manually, instead of using the organizer program? This is a truncated portion of the log, but it shows you have a lot of add ons in general, which can also cause problems. The more you add, the more variables there are to try to figure out what actually causes the problems. One test you can try is downloading a second copy with no add ons to see if just adding the orthophoto tiles still cause issues or not.