I am having a problem with Validate Topology - ArcMap Crashes, with "unexpected Problem caused.....". Arc 10.2 Windows 7. I only have one rule - must not overlap. It is a buffer of selected streams, dissolved. 136 features in the buffer. Only one feature in the GDB, 2.7 MB. I have tried several approaches - zooming in to one or two features, really zooming in to an area I suspect has an overlap, creating a new GDB, importing the feature and creating a new topology. I have also tried validating in ArcCatalog after creating a new topology. I also tried a check out license vs a network license and moving the data from Network to Local drive. I also did a repair geometry then tried to validate.