Tiled 0.18.2 is out now, bringing some bugfixes and minor improvements.
A note for Windows users upgrading from 0.18.0 or older versions using the installer: Please first uninstall Tiled manually and then reinstall using the installer. Due to fixing the installer to work properly system-wide, it will fail to upgrade versions before 0.18.1 and leave behind a broken Tiled.
Changelog
- Fixed crash when deleting multiple selected objects
 - Fixed crash when moving multiple selected objects to another object layer
 - Fixed updating of values displayed in Objects and Layers views
 - GmxPlugin: Added support for image collection tilesets
 - Object Types Editor: Improved behavior when adding new types (#1448)
 - Linux: Fixed shipping of image format plugins in AppImage releases (#1444)
 
Thanks to everybody who contributed to this release with bug reports, suggestions or patches!