When you create a folder, how are you doing it? Via button? script? the right-click context menu item? other?
Does the Create Folder dialog window open? if so, whats checked on?
Are you creating folders on a local drive? removable drive? network share?
I would backup your settings, then uninstall. reboot. install latest (reboot if needed). Test again (before restoring backup config). If working, restore config and test again.
You should be able to stop the crash by resetting your folder infotips to the default.
It seems to be triggered by having {foldersize} and {dircount} together in the folder infotip, and then causing the infotip to appear for a new folder while in thumbnails mode. (I suspect you're hovering over the folder just long enough for the infotip to trigger before you double-click.)