Troubleshooting - Scenes, still pictures cannot be deleted.

Release the protect setting. Refer to "How to protect, unprotect a scene or still picture - HC-X1".
It may not be possible to delete any scenes/still pictures where the thumbnails are displayed as an exclamation mark.
If the scenes/still pictures are unnecessary format the SD card to erase the data. Please be aware that if a SD card is formatted then all the data recorded on the SD card is erased and cannot be recovered. Back up important data on a PC etc.