If iMovie starts to behave badly then this usually depends on:
• Corrupted iMovie pref. file - Trash it and re-start iMovie
• Preferences file gone wrong - Run Repair Preferences
• Corrupted movie project - e.g. use of video-codec iMovie can not use or frame rate that don't work either as p60 or p50 or anything else e.g. audio or photo in strange format. If so all material needs to be inspected and the ailient ones must be converted to work and Project needs to be re-done.
• Start-Up hard disk fills up - I never gu under 25Gb free space.
As You see it can be many things - Please tell more on what material You use and how this happened - suddenly or never worked from start.
Yours Bengt W
I've already tried deleting the pref. file,
You found it in the right Library - Not the one on first window on Start-Up hard disk - but the one in Your User account. Hidden if You use Mac OS X.7
I've got plenty of room on my hard disk,
Only the Start-Up hard disk is of interest - my minimum is 25Gb free space
If You have any External Hard disk You use for VIDEO - It/they must be Mac OS Extended formatted - UNIX/DOS/FAT32/Mac OS Exchange works for most other things but not for VIDEO - they breaks the video file beyond repair.
and I'm not sure how you run repair preferences.
Run Disk Util tool and to the left select Your hard disk - now under the big white area to the right You read
Control Permissions and Repair Permissions - AND Control and Repair Hard Disk
To do the last ones Your Mac need to be started from DVD or other hard disk. Can not do Brain Surgery on one self.
I'm not to sure about the corrupted movie project thing.
Start a new iMovie project (Plus sign under Project Library) and put in one clip at a time and see if all works OK - If it starts to ill behave then last included clip might be the problematic one.
Yours Bengt W