Before posting, have a look at our Troubleshooting page, in case that solves your problem. You may also want to do a search for a bug, before reporting it.
When posting, make sure that you provide as much information as possible: - Your computer specs - Which version of the software you are using - How many images, what file format - When does the crash/problem occur exactly? - Can you recreate the problem? If yes, what is your precise workflow? - Is the same using a different project? If not, what's the difference between the two? - Screenshots, we love those - etc..