Slider

Hi, having issues with slider, some images it says unrecognised extension when I'm uploading some .jpg files and other times it will accept .jpg file with a different name. So I've had to randomly rename some of my pictures. Also once its uploaded the picture thumbnails in the admin section of the slider turns to question marks indicating it can't find the image.

It can happen if the name of your file isn't written in latin letters.

Its from digital camera, so they are something like DSC10002 etc and some will work from the series, others in the same series will not work

Probably, you get the error because of the size of your image. Here is the intelligible instruction on how to fix this - http://houseoflaudanum.com/navigate/howtos/php-max_upload_size/.