Nobody can tell you anything without proper system info or other technical details. assertion errors are system errors, anyway. Anything from broken drivers to missing system updates...
Running windows 8.
i was making a new catelog for some photo editing and it just went funny. went to re-open itself as it gives me the 'Assertion error'. So i read some forums and it tells me to check the registry path and if not check the picture folder. and then last resort re-install. which ive done twice. still the same I've tried opening a different catelog.
it just doesnt make sense.
come on ADOBE..make me happy again
I am moving this to the Lightroom forum for attention